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  1. Chicken McNewblet
    Join Date
    Sep 2009
    Location
    United States
    Search Comp PM
    Hey guys!

    So I'm really trying hard to get good at FFMpeg, and I had one particular reason to use it lately. I occasionally convert VHS tapes to DVD, and I do this by way of an El Gato capture card. Normally I would use Avidemux for something like this, but for some reason I can't get the captured files to open in that program. The El Gato native capture format is AVC inside of a .ts container, with the following streams in it:

    Code:
        Stream #0:0[0x64]: Video: h264 (High) ([27][0][0][0] / 0x001B), yuv420p(tv, smpte170m/smpte170m/bt709, top first), 720x480 [SAR 10:11 DAR 15:11], 29.97 fps, 59.94 tbr, 90k tbn, 59.94 tbc
        Stream #0:1[0x66]: Video: mpeg2video ([2][0][0][0] / 0x0002), none(tv), 90k tbr, 90k tbn, 90k tbc
        Stream #0:2[0x67](eng): Audio: aac (LC) ([15][0][0][0] / 0x000F), 48000 Hz, stereo, fltp, 227 kb/s
        Stream #0:3[0x69](eng): Audio: aac (LC) ([15][0][0][0] / 0x000F), 48000 Hz, stereo, fltp, 224 kb/s
        Stream #0:4[0x3ec](eng): Audio: aac (LC) ([15][0][0][0] / 0x000F), 48000 Hz, stereo, fltp, 224 kb/s
        Stream #0:5[0x3f0](eng): Audio: aac (LC) ([15][0][0][0] / 0x000F), 48000 Hz, stereo, fltp, 224 kb/s
        Stream #0:6[0x3f7](eng): Audio: aac (LC) ([15][0][0][0] / 0x000F), 48000 Hz, stereo, fltp, 224 kb/s
        Stream #0:7[0x65](eng): Audio: aac (LC) ([15][0][0][0] / 0x000F), 48000 Hz, stereo, fltp, 227 kb/s
        Stream #0:8[0x3f3](eng): Audio: aac (LC) ([15][0][0][0] / 0x000F), 48000 Hz, stereo, fltp, 224 kb/s
        Stream #0:9[0x3eb](eng): Audio: aac (LC) ([15][0][0][0] / 0x000F), 48000 Hz, stereo, fltp, 224 kb/s
        Stream #0:10[0x3f5](eng): Audio: aac (LC) ([15][0][0][0] / 0x000F), 48000 Hz, stereo, fltp, 224 kb/s
        Stream #0:11[0x3ed](eng): Audio: aac (LC) ([15][0][0][0] / 0x000F), 48000 Hz, stereo, fltp, 224 kb/s
        Stream #0:12[0x3f1](eng): Audio: aac (LC) ([15][0][0][0] / 0x000F), 48000 Hz, stereo, fltp, 224 kb/s
        Stream #0:13[0x4e7](eng): Audio: aac (LC) ([15][0][0][0] / 0x000F), 48000 Hz, stereo, fltp, 224 kb/s
    All I need is stream 0:0 and 0:2.

    The following command is what I use to select those two streams and swap to an .MP4 container so it will play nice with a wider variety of programs.

    Code:
    ffmpeg -i MOVIE.ts -map 0:0 -map 0:2 -c:v copy -c:a copy OUTPUT.mp4
    And it...sort of works? The audio and video play, but there are some discrepancies reported by MediaInfo, notably the bitrate which confuses me.

    Original video (with irrelevant audio streams excluded):

    Code:
    General
    ID                                       : 1 (0x1)
    Complete name                            : C:\Users\Cursed Lemon\Videos\EGC_Library\My Great Game - My Great Capture - 2018-08-25 00-24-05\Recording_2018-08-25_00-24-05_0011.ts
    Format                                   : MPEG-TS
    File size                                : 2.55 GiB
    Duration                                 : 24 min 29 s
    Overall bit rate mode                    : Variable
    Overall bit rate                         : 14.9 Mb/s
    
    Video
    ID                                       : 100 (0x64)
    Menu ID                                  : 2 (0x2)
    Format                                   : AVC
    Format/Info                              : Advanced Video Codec
    Format profile                           : High@L3.1
    Format settings, CABAC                   : Yes
    Format settings, ReFrames                : 2 frames
    Format settings, GOP                     : M=2, N=14
    Codec ID                                 : 27
    Duration                                 : 24 min 29 s
    Width                                    : 720 pixels
    Height                                   : 480 pixels
    Display aspect ratio                     : 4:3
    Frame rate                               : 29.970 (30000/1001) FPS
    Standard                                 : NTSC
    Color space                              : YUV
    Chroma subsampling                       : 4:2:0
    Bit depth                                : 8 bits
    Scan type                                : Interlaced
    Scan type, store method                  : Separated fields
    Scan order                               : Top Field First
    Color range                              : Limited
    Color primaries                          : BT.601 NTSC
    Transfer characteristics                 : BT.709
    Matrix coefficients                      : BT.601
    
    Audio #1
    ID                                       : 101 (0x65)
    Menu ID                                  : 2 (0x2)
    Format                                   : AAC
    Format/Info                              : Advanced Audio Codec
    Format version                           : Version 4
    Format profile                           : LC
    Muxing mode                              : ADTS
    Codec ID                                 : 15
    Duration                                 : 24 min 29 s
    Bit rate mode                            : Variable
    Channel(s)                               : 2 channels
    Channel positions                        : Front: L R
    Sampling rate                            : 48.0 kHz
    Frame rate                               : 46.875 FPS (1024 spf)
    Compression mode                         : Lossy
    Delay relative to video                  : -4 ms
    Language                                 : English
    Converted video:

    Code:
    General
    Complete name                            : C:\Users\Cursed Lemon\Videos\EGC_Library\My Great Game - My Great Capture - 2018-08-25 00-24-05\test.mp4
    Format                                   : MPEG-4
    Format profile                           : Base Media
    Codec ID                                 : isom (isom/iso2/avc1/mp41)
    File size                                : 1.97 GiB
    Duration                                 : 24 min 30 s
    Overall bit rate mode                    : Variable
    Overall bit rate                         : 11.5 Mb/s
    Writing application                      : Lavf58.17.103
    
    Video
    ID                                       : 1
    Format                                   : AVC
    Format/Info                              : Advanced Video Codec
    Format profile                           : High@L3.1
    Format settings, CABAC                   : Yes
    Format settings, ReFrames                : 2 frames
    Format settings, GOP                     : M=2, N=14
    Codec ID                                 : avc1
    Codec ID/Info                            : Advanced Video Coding
    Duration                                 : 24 min 30 s
    Bit rate                                 : 11.3 Mb/s
    Width                                    : 720 pixels
    Height                                   : 480 pixels
    Display aspect ratio                     : 4:3
    Frame rate mode                          : Variable
    Frame rate                               : 59.940 (59940/1000) FPS
    Minimum frame rate                       : 6.660 FPS
    Maximum frame rate                       : 90 000.000 FPS
    Original frame rate                      : 29.970 (30000/1001) FPS
    Color space                              : YUV
    Chroma subsampling                       : 4:2:0
    Bit depth                                : 8 bits
    Scan type                                : Interlaced
    Scan type, store method                  : Separated fields
    Scan order                               : Top Field First
    Bits/(Pixel*Frame)                       : 0.543
    Stream size                              : 1.93 GiB (98%)
    Color range                              : Limited
    Color primaries                          : BT.601 NTSC
    Transfer characteristics                 : BT.709
    Matrix coefficients                      : BT.601
    
    Audio
    ID                                       : 2
    Format                                   : AAC
    Format/Info                              : Advanced Audio Codec
    Format profile                           : LC
    Codec ID                                 : 40
    Duration                                 : 24 min 30 s
    Bit rate mode                            : Variable
    Bit rate                                 : 221 kb/s
    Maximum bit rate                         : 228 kb/s
    Channel(s)                               : 2 channels
    Channel positions                        : Front: L R
    Sampling rate                            : 48.0 kHz
    Frame rate                               : 46.875 FPS (1024 spf)
    Compression mode                         : Lossy
    Stream size                              : 38.8 MiB (2%)
    Language                                 : English
    Default                                  : Yes
    Alternate group                          : 1
    Further, when converting the video, the following message shows up repeatedly through the conversion process:

    Code:
    ...
    [mp4 @ 0000021e98059280] Invalid DTS: 132284670 PTS: 132280164 in output stream 0:0, replacing by guess
    [mp4 @ 0000021e98059280] Invalid DTS: 132284670 PTS: 132281666 in output stream 0:0, replacing by guess
    [mp4 @ 0000021e98059280] Non-monotonous DTS in output stream 0:0; previous: 132284670, current: 132284670; changing to 132284671. This may result in incorrect timestamps in the output file.
    [mp4 @ 0000021e98059280] Invalid DTS: 132290675 PTS: 132286171 in output stream 0:0, replacing by guess
    [mp4 @ 0000021e98059280] Non-monotonous DTS in output stream 0:0; previous: 132290675, current: 132290675; changing to 132290676. This may result in incorrect timestamps in the output file.
    [mp4 @ 0000021e98059280] Invalid DTS: 132290675 PTS: 132287673 in output stream 0:0, replacing by guess
    [mp4 @ 0000021e98059280] Non-monotonous DTS in output stream 0:0; previous: 132290676, current: 132290675; changing to 132290677. This may result in incorrect timestamps in the output file.
    [mp4 @ 0000021e98059280] Invalid DTS: 132296681 PTS: 132292176 in output stream 0:0, replacing by guess
    [mp4 @ 0000021e98059280] Non-monotonous DTS in output stream 0:0; previous: 132296682, current: 132296681; changing to 132296683. This may result in incorrect timestamps in the output file.
    [mp4 @ 0000021e98059280] Invalid DTS: 132296681 PTS: 132293678 in output stream 0:0, replacing by guess
    [mp4 @ 0000021e98059280] Non-monotonous DTS in output stream 0:0; previous: 132296683, current: 132296681; changing to 132296684. This may result in incorrect timestamps in the output file.
    [mp4 @ 0000021e98059280] Invalid DTS: 132302688 PTS: 132298182 in output stream 0:0, replacing by guess
    [mp4 @ 0000021e98059280] Invalid DTS: 132302688 PTS: 132299684 in output stream 0:0, replacing by guess
    [mp4 @ 0000021e98059280] Non-monotonous DTS in output stream 0:0; previous: 132302688, current: 132302688; changing to 132302689. This may result in incorrect timestamps in the output file.
    ...
    Similarly, when I attempt to swap the container to an MKV instead of an MP4, I get the following error:

    Code:
    ...
    [matroska @ 0000019a67cf3f00] Invalid DTS: 1469629 PTS: 1469596 in output stream 0:0, replacing by guess
    [matroska @ 0000019a67cf3f00] Invalid DTS: 1469696 PTS: 1469646 in output stream 0:0, replacing by guess
    [matroska @ 0000019a67cf3f00] Invalid DTS: 1469696 PTS: 1469663 in output stream 0:0, replacing by guess
    [matroska @ 0000019a67cf3f00] Invalid DTS: 1469763 PTS: 1469713 in output stream 0:0, replacing by guess
    [matroska @ 0000019a67cf3f00] Invalid DTS: 1469763 PTS: 1469730 in output stream 0:0, replacing by guess
    [matroska @ 0000019a67cf3f00] Invalid DTS: 1469830 PTS: 1469780 in output stream 0:0, replacing by guess
    [matroska @ 0000019a67cf3f00] Invalid DTS: 1469830 PTS: 1469796 in output stream 0:0, replacing by guess
    [matroska @ 0000019a67cf3f00] Invalid DTS: 1469896 PTS: 1469846 in output stream 0:0, replacing by guess
    [matroska @ 0000019a67cf3f00] Invalid DTS: 1469896 PTS: 1469863 in output stream 0:0, replacing by guess
    ...
    Does anyone know what this error means, and why the video characteristics (frame rate, bit rate, etc.) are showing differently?

    EDIT: This also seems to happen when I try to concatenate the TS files using FFMpeg.
    Quote Quote  
  2. Hi, I've seen that "Non-monotonous DTS in output stream" problem from time to time, too. Usually connected to the audio stream.

    Is it possible that you extract a piece of your video and upload it?
    Quote Quote  
  3. Chicken McNewblet
    Join Date
    Sep 2009
    Location
    United States
    Search Comp PM
    Originally Posted by fornit View Post
    Hi, I've seen that "Non-monotonous DTS in output stream" problem from time to time, too. Usually connected to the audio stream.

    Is it possible that you extract a piece of your video and upload it?
    I've attached a small fragment that the El Gato software decided needed its own "chapter". :B
    Image Attached Files
    • File Type: ts 2.ts (5.57 MB, 340 views)
    Quote Quote  
  4. Member
    Join Date
    Aug 2010
    Location
    San Francisco, California
    Search PM
    Try adding -copytb 1 as an output option.
    Quote Quote  
  5. It seems that decoding time stamps are broken. You can try "-fflags +igndts" to regenerate DTS based on PTS:

    Code:
    ffmpeg -fflags +igndts -i MOVIE.ts -map 0:0 -map 0:2 -c:v copy -c:a copy OUTPUT.mp4
    Quote Quote  



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