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  1. Hi guys,
    I'm completely lost

    I have a huge restoration project, where I have to capture old videos from a server.
    the actual files are not accessible, so I use internet download manager to capture them.

    the videos play fine but here is the thing.

    At the begging, video and audio are synced.

    but as the video plays along, it seems like it's increasingly going faster and faster than the audio.
    I assumed that it was due to inconsistent framerate while capturing, so i tried re-encoding the video with handbrake while choosing "constant framerate"
    but once re encoded, the video and audio are still not synced, and the difference is still variable ( not a permanent unsynced, but an increasing one)

    how can it be?
    if I lock the framerate how can this still happen?

    appreciate all the help i can get.

    Thanks !
    Quote Quote  
  2. aBigMeanie aedipuss's Avatar
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    get access to the original files. if you can't you probably don't have permission anyway.
    --
    "a lot of people are better dead" - prisoner KSC2-303
    Quote Quote  
  3. Originally Posted by aedipuss View Post
    get access to the original files. if you can't you probably don't have permission anyway.
    The original files are small chunks of data combined by a very old specially programmed player for an old project.
    this was developed several years ago, and there is no way to get the person who builds this.

    the owner lost his own originals (previously tapes) so he wants to get whatever he can from the old streaming server.

    I don't see how the permission issue is related to my video rendering question.
    Quote Quote  
  4. aBigMeanie aedipuss's Avatar
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    if the source files are going out of sync than no amount of re-encoding them will solve the issue. all you are doing is changing the format. you could try using video editing software to separate the audio and video which would allow you to stretch or shrink the audio to try and get them to align.
    --
    "a lot of people are better dead" - prisoner KSC2-303
    Quote Quote  
  5. Originally Posted by aedipuss View Post
    if the source files are going out of sync than no amount of re-encoding them will solve the issue. all you are doing is changing the format. you could try using video editing software to separate the audio and video which would allow you to stretch or shrink the audio to try and get them to align.
    Hi,
    thank you for your reply.
    when I play the videos on the dedicated player the sound is fine.
    but when I capture it with IDM this sync issue occurs.

    i was thinking that making the frame rate constant will make the async stable, than once synced on an editing program the whole video will be synced.
    but I'm syncing a specific spot, and everything else becomes unsync
    Quote Quote  
  6. Is the IDM downloaded version in sync with the dedicated player? What about another media player, like MPCHC, or VLC , or MPV ?

    If everything is out of sync with IDM downloaded version, then your downloaded version is out of sync. Try downloading with something else
    Quote Quote  
  7. Originally Posted by poisondeathray View Post
    Is the IDM downloaded version in sync with the dedicated player? What about another media player, like MPCHC, or VLC , or MPV ?

    If everything is out of sync with IDM downloaded version, then your downloaded version is out of sync. Try downloading with something else
    I thought that cases like this are caused by variable framerate. is that the case?
    if that's the case, why re-encoding to a constant frame rate doesn't make the sync issue constant?
    if it was constant, I could have easily fix it with an editing program.

    giving that the sound isn't cutting, and running in a constant past, if I'm making the video run in a constant paste, it should solve it, shouldn't it ?
    what am I missing ?
    Quote Quote  
  8. Originally Posted by tzimber View Post
    I thought that cases like this are caused by variable framerate. is that the case?
    if that's the case, why re-encoding to a constant frame rate doesn't make the sync issue constant?
    It depends on the editor. Some editors will duplicate or decimate frames to get a constant frame rate. That will keep the audio in sync. But some editors assume every frame of the source has the same duration. That will lose audio sync.
    Quote Quote  
  9. Originally Posted by tzimber View Post
    Originally Posted by poisondeathray View Post
    Is the IDM downloaded version in sync with the dedicated player? What about another media player, like MPCHC, or VLC , or MPV ?

    If everything is out of sync with IDM downloaded version, then your downloaded version is out of sync. Try downloading with something else
    I thought that cases like this are caused by variable framerate. is that the case?
    if that's the case, why re-encoding to a constant frame rate doesn't make the sync issue constant?
    if it was constant, I could have easily fix it with an editing program.

    giving that the sound isn't cutting, and running in a constant past, if I'm making the video run in a constant paste, it should solve it, shouldn't it ?
    what am I missing ?


    If it's variable framerate and in sync - in a normal media player - then converting to CFR will keep it pretty much in sync too (might be slightly in/out of sync in sections, but would be very minor). Answer the question about MPCHC, VLC played locally. If it's already out of sync, then the problem is likely downloading and appending segments.

    Other causes are problems downloading and appending segments - Gaps and offsets of audio and video stream of each segment cause it to be progressively out of sync. It might be ok for 1 segment, but for example, the audio is 40ms longer than the video. But you have 20 segments. By the end you have 800ms longer audio because each segment audio is longer than the video. It can be the reverse case - longer video than audio too. Mismatched AV duration causes progressively out of sync
    Quote Quote  
  10. [QUOTE=poisondeathray;2607194]
    Originally Posted by tzimber View Post
    Originally Posted by poisondeathray View Post
    Is the IDM downloaded version in sync with the dedicated player? What about another media player, like MPCHC, or VLC , or MPV ?

    If everything is out of sync with IDM downloaded version, then your downloaded version is out of sync. Try downloading with something else
    I thought that cases like this are caused by variable framerate. is that the case?
    if that's the case, why re-encoding to a constant frame rate doesn't make the sync issue constant?
    if it was constant, I could have easily fix it with an editing program.

    giving that the sound isn't cutting, and running in a constant past, if I'm making the video run in a constant paste, it should solve it, shouldn't it ?
    what am I missing ?[/QUO




    If it's variable framerate and in sync - in a normal media player - then converting to CFR will keep it pretty much in sync too (might be slightly in/out of sync in sections, but would be very minor). Answer the question about MPCHC, VLC played locally. If it's already out of sync, then the problem is likely downloading and appending segments.

    Other causes are problems downloading and appending segments - Gaps and offsets of audio and video stream of each segment cause it to be progressively out of sync. It might be ok for 1 segment, but for example, the audio is 40ms longer than the video. But you have 20 segments. By the end you have 800ms longer audio because each segment audio is longer than the video. It can be the reverse case - longer video than audio too. Mismatched AV duration causes progressively out of sync
    Hi,
    the problem is defiantly when downloading.
    all players open it in the same way.
    it starts with no/very little delay at the beginning than in the end, the video ends, and the audio keeps running for another 1 minute or so...
    that happens on all videos that are about 1 - 1:20 hours long...
    in all of them, this async is pretty much the same.

    is there any way to bypass this?
    maybe capture it in a different way?
    IDM was the only tool that recognized this stream and was able to capture it...
    Quote Quote  
  11. Member
    Join Date
    Mar 2008
    Location
    United States
    Search Comp PM
    Post a mediainfo report (in "text" view) of one of these files
    Quote Quote  
  12. Originally Posted by tzimber View Post
    Hi guys,
    I'm completely lost

    I have a huge restoration project, where I have to capture old videos from a server.
    the actual files are not accessible, so I use internet download manager to capture them.

    the videos play fine but here is the thing.

    At the begging, video and audio are synced.

    but as the video plays along, it seems like it's increasingly going faster and faster than the audio.
    I assumed that it was due to inconsistent framerate while capturing, so i tried re-encoding the video with handbrake while choosing "constant framerate"
    but once re encoded, the video and audio are still not synced, and the difference is still variable ( not a permanent unsynced, but an increasing one)

    how can it be?
    if I lock the framerate how can this still happen?

    appreciate all the help i can get.

    Thanks !
    Maybe wrong, but this is exactly what used to happen to me when I used to capture video streams (from any source) using my Elgato capp card and their proprietary software. The RAW stream was in TS format and I used to process it (Save it to disk) to Mp4 using the bundled app. The resultant Mp4 from the TS started off in perfect audio sync, but gradually got out of sync thereby impossible to pull back with Avidemux copy delay as it was a progressive error not a constant delay.

    The solution (for me) and still is, is to save the capp in TS format and use ffmpeg to 'convert' it Mkv or Mp4

    Code:
    ffmpeg -i input.ts -c copy output.mkv
    and all the audio remains in sync....so

    you don't say what format the videos are in that you are downloading.

    Few more details/stats required I think before anyone can help/assist you.
    Quote Quote  
  13. Originally Posted by codehound View Post
    Originally Posted by tzimber View Post
    Hi guys,
    I'm completely lost

    I have a huge restoration project, where I have to capture old videos from a server.
    the actual files are not accessible, so I use internet download manager to capture them.

    the videos play fine but here is the thing.

    At the begging, video and audio are synced.

    but as the video plays along, it seems like it's increasingly going faster and faster than the audio.
    I assumed that it was due to inconsistent framerate while capturing, so i tried re-encoding the video with handbrake while choosing "constant framerate"
    but once re encoded, the video and audio are still not synced, and the difference is still variable ( not a permanent unsynced, but an increasing one)

    how can it be?
    if I lock the framerate how can this still happen?

    appreciate all the help i can get.

    Thanks !
    Maybe wrong, but this is exactly what used to happen to me when I used to capture video streams (from any source) using my Elgato capp card and their proprietary software. The RAW stream was in TS format and I used to process it (Save it to disk) to Mp4 using the bundled app. The resultant Mp4 from the TS started off in perfect audio sync, but gradually got out of sync thereby impossible to pull back with Avidemux copy delay as it was a progressive error not a constant delay.

    The solution (for me) and still is, is to save the capp in TS format and use ffmpeg to 'convert' it Mkv or Mp4

    Code:
    ffmpeg -i input.ts -c copy output.mkv
    and all the audio remains in sync....so

    you don't say what format the videos are in that you are downloading.

    Few more details/stats required I think before anyone can help/assist you.
    Hi,
    thanks for the input.

    IDM saves the files as Mp4.
    It seems that some are 25FPS and some are 60.1FPS and 24.18FPS and 30.17FPS and so on...
    i assume that the FPS that I see when I right-click on a file doesn't mean too much, because it's changing and not constant.
    that's why I was thinking that if I set the video to a constant frame rate the delay will become stable and not variable...
    Quote Quote  
  14. Originally Posted by tzimber View Post
    Originally Posted by codehound View Post
    Originally Posted by tzimber View Post
    Hi guys,
    I'm completely lost

    I have a huge restoration project, where I have to capture old videos from a server.
    the actual files are not accessible, so I use internet download manager to capture them.

    the videos play fine but here is the thing.

    At the begging, video and audio are synced.

    but as the video plays along, it seems like it's increasingly going faster and faster than the audio.
    I assumed that it was due to inconsistent framerate while capturing, so i tried re-encoding the video with handbrake while choosing "constant framerate"
    but once re encoded, the video and audio are still not synced, and the difference is still variable ( not a permanent unsynced, but an increasing one)

    how can it be?
    if I lock the framerate how can this still happen?

    appreciate all the help i can get.

    Thanks !
    Maybe wrong, but this is exactly what used to happen to me when I used to capture video streams (from any source) using my Elgato capp card and their proprietary software. The RAW stream was in TS format and I used to process it (Save it to disk) to Mp4 using the bundled app. The resultant Mp4 from the TS started off in perfect audio sync, but gradually got out of sync thereby impossible to pull back with Avidemux copy delay as it was a progressive error not a constant delay.

    The solution (for me) and still is, is to save the capp in TS format and use ffmpeg to 'convert' it Mkv or Mp4

    Code:
    ffmpeg -i input.ts -c copy output.mkv
    and all the audio remains in sync....so

    you don't say what format the videos are in that you are downloading.

    Few more details/stats required I think before anyone can help/assist you.
    Hi,
    thanks for the input.

    IDM saves the files as Mp4.
    It seems that some are 25FPS and some are 60.1FPS and 24.18FPS and 30.17FPS and so on...
    i assume that the FPS that I see when I right-click on a file doesn't mean too much, because it's changing and not constant.
    that's why I was thinking that if I set the video to a constant frame rate the delay will become stable and not variable...
    Tryied to do what you said, on the MP4 file.
    the output file has the same delay issue...


    ffmpeg -i bdt7.mp4 -c copy bdt7mkv.mkv

    ffmpeg version 4.3.1-2021-01-01-full_build-www.gyan.dev Copyright (c) 2000-2021 the FFmpeg developers
    built with gcc 10.2.0 (Rev5, Built by MSYS2 project)
    configuration: --enable-gpl --enable-version3 --enable-static --disable-w32threads --disable-autodetect --enable-fontconfig --enable-iconv --enable-gnutls --enable-libxml2 --enable-gmp --enable-lzma --enable-libsnappy --enable-zlib --enable-libsrt --enable-libssh --enable-libzmq --enable-avisynth --enable-libbluray --enable-libcaca --enable-sdl2 --enable-libdav1d --enable-libzvbi --enable-librav1e --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxvid --enable-libaom --enable-libopenjpeg --enable-libvpx --enable-libass --enable-frei0r --enable-libfreetype --enable-libfribidi --enable-libvidstab --enable-libvmaf --enable-libzimg --enable-amf --enable-cuda-llvm --enable-cuvid --enable-ffnvcodec --enable-nvdec --enable-nvenc --enable-d3d11va --enable-dxva2 --enable-libmfx --enable-libcdio --enable-libgme --enable-libmodplug --enable-libopenmpt --enable-libopencore-amrwb --enable-libmp3lame --enable-libshine --enable-libtheora --enable-libtwolame --enable-libvo-amrwbenc --enable-libilbc --enable-libgsm --enable-libopencore-amrnb --enable-libopus --enable-libspeex --enable-libvorbis --enable-ladspa --enable-libbs2b --enable-libflite --enable-libmysofa --enable-librubberband --enable-libsoxr --enable-chromaprint
    libavutil 56. 51.100 / 56. 51.100
    libavcodec 58. 91.100 / 58. 91.100
    libavformat 58. 45.100 / 58. 45.100
    libavdevice 58. 10.100 / 58. 10.100
    libavfilter 7. 85.100 / 7. 85.100
    libswscale 5. 7.100 / 5. 7.100
    libswresample 3. 7.100 / 3. 7.100
    libpostproc 55. 7.100 / 55. 7.100
    Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'bdt7.mp4':
    Metadata:
    major_brand : isom
    minor_version : 512
    compatible_brands: isomiso2avc1mp41
    Duration: 01:22:00.03, start: 0.000000, bitrate: 1299 kb/s
    Stream #0:0(und): Video: h264 (Baseline) (avc1 / 0x31637661), yuv420p(tv), 640x480 [SAR 1024:1024 DAR 4:3], 1233 kb/s, 30.17 fps, 30 tbr, 1k tbn, 59.94 tbc (default)
    Metadata:
    handler_name : USP Video Handler
    encoder : AVC Coding
    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 61 kb/s (default)
    Metadata:
    handler_name : USP Sound Handler
    Output #0, matroska, to 'bdt7mkv.mkv':
    Metadata:
    major_brand : isom
    minor_version : 512
    compatible_brands: isomiso2avc1mp41
    encoder : Lavf58.45.100
    Stream #0:0(und): Video: h264 (Baseline) (avc1 / 0x31637661), yuv420p(tv), 640x480 [SAR 1024:1024 DAR 4:3], q=2-31, 1233 kb/s, 30.17 fps, 30 tbr, 1k tbn, 1k tbc (default)
    Metadata:
    handler_name : USP Video Handler
    encoder : AVC Coding
    Stream #0:1(und): Audio: aac (LC) ([255][0][0][0] / 0x00FF), 44100 Hz, stereo, fltp, 61 kb/s (default)
    Metadata:
    handler_name : USP Sound Handler
    Stream mapping:
    Stream #0:0 -> #0:0 (copy)
    Stream #0:1 -> #0:1 (copy)
    Press [q] to stop, [?] for help
    frame=147452 fps=59091 q=-1.0 Lsize= 775454kB time=01:22:00.00 bitrate=1291.2kbits/s speed=1.97e+03x
    video:735921kB audio:37038kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.322720%
    Quote Quote  
  15. Originally Posted by davexnet View Post
    Post a mediainfo report (in "text" view) of one of these files
    Hi,
    sure:

    General
    Complete name : C:\bdt7.mp4
    Format : MPEG-4
    Format profile : Base Media
    Codec ID : isom (isom/iso2/avc1/mp41)
    File size : 762 MiB
    Duration : 1 h 22 min
    Overall bit rate mode : Constant
    Overall bit rate : 1 300 kb/s

    Video
    ID : 1
    Format : AVC
    Format/Info : Advanced Video Codec
    Format profile : Baseline@L3
    Format settings : 2 Ref Frames
    Format settings, CABAC : No
    Format settings, Reference frames : 2 frames
    Codec ID : avc1
    Codec ID/Info : Advanced Video Coding
    Duration : 1 h 21 min
    Source duration : 1 h 21 min
    Bit rate mode : Constant
    Bit rate : 1 241 kb/s
    Width : 640 pixels
    Height : 480 pixels
    Display aspect ratio : 4:3
    Frame rate mode : Variable
    Frame rate : 29.970 FPS
    Standard : NTSC
    Color space : YUV
    Chroma subsampling : 4:2:0
    Bit depth : 8 bits
    Scan type : Progressive
    Bits/(Pixel*Frame) : 0.135
    Stream size : 719 MiB (94%)
    Source stream size : 719 MiB (94%)
    Color range : Limited
    Codec configuration box : avcC

    Audio
    ID : 2
    Format : AAC LC
    Format/Info : Advanced Audio Codec Low Complexity
    Codec ID : mp4a-40-2
    Duration : 1 h 22 min
    Bit rate mode : Constant
    Bit rate : 62.0 kb/s
    Channel(s) : 2 channels
    Channel layout : L R
    Sampling rate : 44.1 kHz
    Frame rate : 43.066 FPS (1024 SPF)
    Compression mode : Lossy
    Stream size : 36.2 MiB (5%)
    Default : Yes
    Alternate group : 1
    Quote Quote  
  16. Member
    Join Date
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    United States
    Search Comp PM
    An Avisynth script like this has worked well in the past, it forces a constant frame rate.
    Then encode in Virtualdub or StaxRip
    Code:
    Audio = lwlibavAudioSource("c:\path\movie.mp4")
    video = lwlibavVideoSource("c:\path\movie.mp4", fpsnum=30000, fpsden=1001) # force 29.97 fps
    Video = Video.ConvertToYV12()
    Audiodub(video,audio)
    Quote Quote  
  17. @OP

    Code:
    IDM was the only tool that recognized this stream and was able to capture it...
    I doubt that very much. Give me the url for one of the videos either publicly or via PM - and I will download it as a raw TS. Then we can convert it with ffmpeg to Mp4 if that's your preferred container.
    Quote Quote  
  18. Originally Posted by codehound View Post
    @OP

    Code:
    IDM was the only tool that recognized this stream and was able to capture it...
    I doubt that very much. Give me the url for one of the videos either publicly or via PM - and I will download it as a raw TS. Then we can convert it with ffmpeg to Mp4 if that's your preferred container.
    Hi,
    I can't do that unfortunately, it's a local server, not concerned to the internet.
    I need to physically go to the customer and connect to his lan to access the streams.
    What software can capture it other than IDM ?
    IDM was the only one that recognise this stream for me and show the download option.

    P.s when IDM recognise is, it shows the video length instead of it's size.

    What other software can recognise it ?

    I can try again...
    Quote Quote  
  19. Originally Posted by tzimber View Post
    What other software can recognise it ?

    I can try again...
    Youtube-dl
    Streamlink
    ffmpeg
    https://mrs0m30n3.github.io/youtube-dl-gui/
    Quote Quote  
  20. Originally Posted by codehound View Post
    Originally Posted by tzimber View Post
    What other software can recognise it ?

    I can try again...
    Youtube-dl
    Streamlink
    ffmpeg
    https://mrs0m30n3.github.io/youtube-dl-gui/
    Note that those are for downloading the video. You may need to get a playlist URL (M3U8, MPD, etc.) for those to download anything. You can usually get a playlist with a web browsers Developer Tools (press F12) set to the Network tab to monitor network traffic.
    Quote Quote  
  21. Originally Posted by codehound View Post
    Originally Posted by tzimber View Post
    What other software can recognise it ?

    I can try again...
    Youtube-dl
    Streamlink
    ffmpeg
    https://mrs0m30n3.github.io/youtube-dl-gui/
    Thanks,
    will any of them recognize the stream automatically?
    because when I use the debug tool, it shows chunks of data, not a complete stream.
    only IDM seems to recognize it as a video and create 1 file out of it...
    Quote Quote  
  22. They are all extremely capable of downloading a stream in chunks and reforming it into one single entity. As jagabo has stated you need to use the F12 (DevTools) of your browser to search for either an mpd or m3u8 or some other playlist url to be able to download the file in its original RAW format - more than likely TS. We can then convert it afterwards to your preferred format. We don't want IDM converting a TS to Mp4 'on the fly' and f*king it up.

    Unless you give us some more information, or the url (and / or access) to what you are trying to download - its impossible to advise you my friend.

    With any of the above mentioned tools we can also download (if necessary) separate audio and video streams and reform them post-download. In sync.

    IDM, albeit a great downloading tool in certain circumstances is the problem in this instance - not the files on the server. If you persist with IDM you will keep reproducing the error you are trying to eradicate 'ad infinitum'. There is no magical setting in IDM that we can advise that will solve this issue.

    Also, Handbraking or Staxripping a video that is progressively out of sync will not cure the issue.
    Last edited by codehound; 16th Jan 2021 at 19:40.
    Quote Quote  
  23. Originally Posted by codehound View Post
    They are all extremely capable of downloading a stream in chunks and reforming it into one single entity. As jagabo has stated you need to use the F12 (DevTools) of your browser to search for either an mpd or m3u8 or some other playlist url to be able to download the file in its original RAW format - more than likely TS. We can then convert it afterwards to your preferred format. We don't want IDM converting a TS to Mp4 'on the fly' and f*king it up.

    Unless you give us some more information, or the url (and / or access) to what you are trying to download - its impossible to advise you my friend.

    With any of the above mentioned tools we can also download (if necessary) separate audio and video streams and reform them post-download. In sync.

    IDM, albeit a great downloading tool in certain circumstances is the problem in this instance - not the files on the server. If you persist with IDM you will keep reproducing the error you are trying to eradicate 'ad infinitum'. There is no magical setting in IDM that we can advise that will solve this issue.

    Also, Handbraking or Staxripping a video that is progressively out of sync will not cure the issue.

    I really appreciate everyone's help with this.
    I was able to convince my customer to get me a PC and connect it locally with a Teamviewer session.
    I can't share the connection, unfortunately, but I did try what you suggested.

    So,
    I found the .mpd file and ran the command on FFMPEG.
    it seems like the server returns several versions to choose from. (different bitrates) I saw it on IDM also and I see it on the player, In the following example, it seems that FFMPEG has chosen the best one (highest bitrate) but can I control it?
    can you look at the command am I doing it correctly?

    I will update once the capturing ends if this works this way or still out of sync.

    here is the output from FFMPEG:

    C:\ffmpeg\bin>ffmpeg.exe -y -i https://192.168.2.28/trainvs/112/112708/112708.ism/112708.mpd?ssauth=29273924-112708-2...hdffcdhaa0a041 test1.mp4
    ffmpeg version 4.3.1-2021-01-01-full_build-www.gyan.dev Copyright (c) 2000-2021 the FFmpeg developers
    built with gcc 10.2.0 (Rev5, Built by MSYS2 project)
    configuration: --enable-gpl --enable-version3 --enable-static --disable-w32threads --disable-autodetect --enable-fontconfig --enable-iconv --enable-gnutls --enable-libxml2 --enable-gmp --enable-lzma --enable-libsnappy --enable-zlib --enable-libsrt --enable-libssh --enable-libzmq --enable-avisynth --enable-libbluray --enable-libcaca --enable-sdl2 --enable-libdav1d --enable-libzvbi --enable-librav1e --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxvid --enable-libaom --enable-libopenjpeg --enable-libvpx --enable-libass --enable-frei0r --enable-libfreetype --enable-libfribidi --enable-libvidstab --enable-libvmaf --enable-libzimg --enable-amf --enable-cuda-llvm --enable-cuvid --enable-ffnvcodec --enable-nvdec --enable-nvenc --enable-d3d11va --enable-dxva2 --enable-libmfx --enable-libcdio --enable-libgme --enable-libmodplug --enable-libopenmpt --enable-libopencore-amrwb --enable-libmp3lame --enable-libshine --enable-libtheora --enable-libtwolame --enable-libvo-amrwbenc --enable-libilbc --enable-libgsm --enable-libopencore-amrnb --enable-libopus --enable-libspeex --enable-libvorbis --enable-ladspa --enable-libbs2b --enable-libflite --enable-libmysofa --enable-librubberband --enable-libsoxr --enable-chromaprint
    libavutil 56. 51.100 / 56. 51.100
    libavcodec 58. 91.100 / 58. 91.100
    libavformat 58. 45.100 / 58. 45.100
    libavdevice 58. 10.100 / 58. 10.100
    libavfilter 7. 85.100 / 7. 85.100
    libswscale 5. 7.100 / 5. 7.100
    libswresample 3. 7.100 / 3. 7.100
    libpostproc 55. 7.100 / 55. 7.100
    Input #0, dash, from 'https://192.168.2.28/trainvs/112/112708/112708.ism/112708.mpd?ssauth=29273924-112708-2021d4345943-dh7f3b9e8ec362fgdfghdffcdhaa0a041':
    Duration: 01:22:00.00, start: 5.015510, bitrate: 0 kb/s
    Program 0
    Stream #0:0: Video: h264 (Baseline) (avc1 / 0x31637661), yuv420p(tv), 320x240 [SAR 1024:1024 DAR 4:3], 102 kb/s, 29.97 fps, 29.97 tbr, 1k tbn, 59.94 tbc
    Metadata:
    variant_bitrate : 194000
    id : video=194000
    Stream #0:1: Video: h264 (Baseline) (avc1 / 0x31637661), yuv420p(tv), 480x360 [SAR 1024:1024 DAR 4:3], 206 kb/s, 29.97 fps, 29.97 tbr, 1k tbn, 59.94 tbc
    Metadata:
    variant_bitrate : 397000
    id : video=397000
    Stream #0:2: Video: h264 (Baseline) (avc1 / 0x31637661), yuv420p(tv), 480x360 [SAR 1024:1024 DAR 4:3], 367 kb/s, 29.97 fps, 29.97 tbr, 1k tbn, 59.94 tbc
    Metadata:
    variant_bitrate : 702000
    id : video=702000
    Stream #0:3: Video: h264 (Baseline) (avc1 / 0x31637661), yuv420p(tv), 640x480 [SAR 1024:1024 DAR 4:3], 650 kb/s, 29.97 fps, 29.97 tbr, 1k tbn, 59.94 tbc
    Metadata:
    variant_bitrate : 1235000
    id : video=1235000
    Stream #0:4: Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 30 kb/s
    Metadata:
    variant_bitrate : 62000
    id : audio=62000
    Stream mapping:
    Stream #0:3 -> #0:0 (h264 (native) -> h264 (libx264))
    Stream #0:4 -> #0:1 (aac (native) -> aac (native))
    Press [q] to stop, [?] for help
    [libx264 @ 0000028dbedcad80] using SAR=1/1
    [libx264 @ 0000028dbedcad80] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2
    [libx264 @ 0000028dbedcad80] profile High, level 3.0, 4:2:0, 8-bit
    [libx264 @ 0000028dbedcad80] 264 - core 161 r3027 4121277 - H.264/MPEG-4 AVC codec - Copyleft 2003-2020 - http://www.videolan.org/x264.html - options: cabac=1 ref=3 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=7 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=15 lookahead_threads=2 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1 b_bias=0 direct=1 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=25 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=crf mbtree=1 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
    Output #0, mp4, to 'test1.mp4':
    Metadata:
    encoder : Lavf58.45.100
    Stream #0:0: Video: h264 (libx264) (avc1 / 0x31637661), yuv420p, 640x480 [SAR 1024:1024 DAR 4:3], q=-1--1, 29.97 fps, 30k tbn, 29.97 tbc
    Metadata:
    variant_bitrate : 1235000
    id : video=1235000
    encoder : Lavc58.91.100 libx264
    Side data:
    cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: N/A
    Stream #0:1: Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 128 kb/s
    Metadata:
    variant_bitrate : 62000
    id : audio=62000
    encoder : Lavc58.91.100 aac
    [dash @ 0000028dbe30d2c0] No longer receiving stream_index 0
    [dash @ 0000028dbe30d2c0] No longer receiving stream_index 1
    [dash @ 0000028dbe30d2c0] No longer receiving stream_index 2
    frame=16373 fps= 43 q=29.0 size= 37120kB time=00:09:06.76 bitrate= 556.2kbits/s dup=1 drop=0 speed=1.42x
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  24. With ffmpeg be sure to specify "-c copy" so the audio and video don't get reencoded (unless that's what you want). I'm sure ffmpeg has some way of letting you specify which of the available streams you want -- but I don't know the program well enough to tell you how.

    I do know how to get a list of streams and how to specify which one you want with youtube-dl. To get a list of available streams:

    Code:
    youtube-dl -F URL
    Among other things you'll get a list something like:

    Code:
    format code           extension  resolution note
    audio-English_stereo  mp4        audio only [en] 
    628                   mp4        320x180     628k , avc1.42c00d, video only
    928                   mp4        480x270     928k , avc1.42c00d, video only
    1728                  mp4        640x360    1728k , avc1.42c00d, video only
    2528                  mp4        960x540    2528k , avc1.42c00d, video only
    4928                  mp4        1280x720   4928k , avc1.42c00d, video only
    9728                  mp4        1920x1080  9728k , avc1.42c00d, video only (best)
    The pick the ones you want via the name or number at the left:

    Code:
    youtube-dl -f 4928+audio-English_stereo URL
    Note the -F and -f switches are case sensitive.
    Quote Quote  
  25. OK so great news finally !!!!
    the videos get encoded and the audio is synced!

    two last questions, if anyone knows how to choose a specific stream to be recorded,
    second, the quality seems to be a little less good than the one I see on the web player.
    is there any way to improve that?
    Quote Quote  
  26. Originally Posted by tzimber View Post
    OK so great news finally !!!!
    the videos get encoded and the audio is synced!
    Why don't you explicitly say what worked for you? It may help the next person with a similar problem.

    Originally Posted by tzimber View Post
    two last questions, if anyone knows how to choose a specific stream to be recorded,
    Using what program? I gave you examples with youtube-dl.

    Originally Posted by tzimber View Post
    second, the quality seems to be a little less good than the one I see on the web player.
    If you reencoded as in post #23 -- of course the quality is less. You reencoded with a lossy codec. Every reencode with a lossy codec will reduce quality.

    Originally Posted by tzimber View Post
    is there any way to improve that?
    Don't reencode. With ffmpeg use "-c copy" instead of reencoding. If the source has chapters or subtitles also use "-map 0".

    Code:
    C:\ffmpeg\bin>ffmpeg.exe -y -i https://192.168.2.28/trainvs/112/112708/112708.ism/112708.mpd?ssauth=29273924-112708-2021d4345943-dh7f3b9e8ec362fgdfghdffcdhaa0a041 -map 0 -c copy test1.mp4
    If you have to reencode for some reason use better quality settings, not the defaults.
    Last edited by jagabo; 17th Jan 2021 at 07:57.
    Quote Quote  
  27. For ffmpeg stream selection, use -map

    eg.

    -map 0:3 -map 0:4

    would select 0:3 and 0:4, or the 640x480 video with the only aac audio


    You have to look at the console output for specific stream map numbering (each video might be different)




    -c:v copy means copy video stream (original quality)
    -c:a copy means copy audio stream (original quality)
    Quote Quote  
  28. [QUOTE=poisondeathray;2607693]For ffmpeg stream selection, use -map

    eg.

    -map 0:3 -map 0:4

    would select 0:3 and 0:4, or the 640x480 video with the only aac audio


    You have to look at the console output for specific stream map numbering (each video might be different)


    thanks !
    will try it now !
    Last edited by tzimber; 17th Jan 2021 at 09:38.
    Quote Quote  
  29. Originally Posted by poisondeathray View Post
    For ffmpeg stream selection, use -map

    eg.

    -map 0:3 -map 0:4

    would select 0:3 and 0:4, or the 640x480 video with the only aac audio


    You have to look at the console output for specific stream map numbering (each video might be different)


    -c:v copy means copy video stream (original quality)
    -c:a copy means copy audio stream (original quality)
    It seems like it doesn't recognise the mapping...

    it returns this:
    Option map (set input stream mapping) cannot be applied to input url https://192.168.2.28/trainvs/112/112708/112708.ism/112708.mpd?ssauth=29273924-112708-2...hdffcdhaa0a041 -- you are trying to apply an input option to an output file or vice versa. Move this option before the file it belongs to.
    Error parsing options for input file https://192.168.2.28/trainvs/112/112708/112708.ism/112708.mpd?ssauth=29273924-112708-2...hdffcdhaa0a041
    Error opening input files: Invalid argument
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  30. OK got it !
    the -MAP should be after the URL.

    let's see how it will come out.

    thanks!
    Quote Quote  



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