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I have an MP4 file and I want to discard all content from 2:22:27 to the end. Using the command
produces an MP4 file which, according to Windows Explorer, is 2:20:43 long (the first oddity; the file should be almost two minutes longer).Code:mp4box -splitx 0:8547 input.mp4 --alltk
Additionally, when watching the output in VLC, the timeline shows a length of 2:20:43, but the audio ends at 1:55:26 and the video ends one second later, at which point VLC closes the file automatically. According to the SRT extracted from the output MP4 with My MP4Box GUI, the subtitles end at that time as well. I want to clarify that the input file (length 2h39min) has fully uncorrupted video, audio and subtitles.
Does anybody know what is going on here and how I can fix it?
I am not using ffmpeg because it can't seem to handle the tx3g subtitle stream particularly well; the MP4 created by ffmpeg contains a subtitle stream but no subs are shown by VLC when activated.
Thank you!
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Last edited by Fleand; 17th Jul 2021 at 07:35.
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Post the complete text view mediainfo report of the source file
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Source file:Originally Posted by davexnet
And the outputted file:Code:General Complete name : D:\input.mp4 Format : MPEG-4 Format profile : Base Media / Version 2 Codec ID : mp42 (mp42/isom/iso2/iso5/dash/avc1/dby1/mp41) File size : 5.79 GiB Duration : 2 h 39 min Overall bit rate : 5 188 kb/s Video ID : 1 Format : AVC Format/Info : Advanced Video Codec Format profile : Main@L3.2 Format settings : CABAC / 2 Ref Frames Format settings, CABAC : Yes Format settings, Reference frames : 2 frames Format settings, GOP : M=2, N=80 Codec ID : avc1 Codec ID/Info : Advanced Video Coding Duration : 2 h 39 min Bit rate : 4 554 kb/s Width : 1 280 pixels Height : 720 pixels Display aspect ratio : 16:9 Frame rate mode : Constant Frame rate : 50.000 FPS Color space : YUV Chroma subsampling : 4:2:0 Bit depth : 8 bits Scan type : Progressive Bits/(Pixel*Frame) : 0.099 Stream size : 5.08 GiB (88%) Language : German Codec configuration box : avcC Audio #1 ID : 2 Format : AAC LC Format/Info : Advanced Audio Codec Low Complexity Codec ID : mp4a-40-2 Duration : 2 h 39 min Bit rate mode : Constant Bit rate : 128 kb/s Channel(s) : 2 channels Channel layout : L R Sampling rate : 48.0 kHz Frame rate : 46.875 FPS (1024 SPF) Compression mode : Lossy Stream size : 145 MiB (2%) Language : German Default : Yes Alternate group : 1 Audio #2 ID : 3 Format : E-AC-3 Format/Info : Enhanced AC-3 Commercial name : Dolby Digital Plus Codec ID : ec-3 Duration : 2 h 39 min Bit rate mode : Constant Bit rate : 256 kb/s Channel(s) : 6 channels Channel layout : L R C LFE Ls Rs Sampling rate : 48.0 kHz Frame rate : 31.250 FPS (1536 SPF) Compression mode : Lossy Stream size : 292 MiB (5%) Language : German Service kind : Complete Main Default : No Alternate group : 1 Text ID : 4 Format : Timed Text Muxing mode : sbtl Codec ID : tx3g Duration : 2 h 39 min Bit rate : 131 b/s Stream size : 153 KiB (0%) Language : German Default : Yes Forced : No Alternate group : 2
Code:General Complete name : D:\input_0.1000_8547000.1000.mp4 Format : MPEG-4 Format profile : Base Media / Version 2 Codec ID : mp42 (isom/mp42/iso2/iso5/dash/avc1/dby1/mp41) File size : 4.00 GiB Duration : 2 h 20 min Overall bit rate mode : Variable Overall bit rate : 4 067 kb/s Encoded date : UTC 2021-07-17 05:50:36 Tagged date : UTC 2021-07-17 05:50:36 Video ID : 1 Format : AVC Format/Info : Advanced Video Codec Format profile : Main@L3.2 Format settings : CABAC / 2 Ref Frames Format settings, CABAC : Yes Format settings, Reference frames : 2 frames Format settings, GOP : M=2, N=80 Codec ID : avc1 Codec ID/Info : Advanced Video Coding Duration : 1 h 55 min Bit rate : 4 566 kb/s Maximum bit rate : 6 409 kb/s Width : 1 280 pixels Height : 720 pixels Display aspect ratio : 16:9 Frame rate mode : Constant Frame rate : 50.000 FPS Color space : YUV Chroma subsampling : 4:2:0 Bit depth : 8 bits Scan type : Progressive Bits/(Pixel*Frame) : 0.099 Stream size : 3.68 GiB (92%) Language : German Tagged date : UTC 2021-07-17 05:54:00 Codec configuration box : avcC Audio #1 ID : 2 Format : AAC LC Format/Info : Advanced Audio Codec Low Complexity Codec ID : mp4a-40-2 Duration : 1 h 55 min Bit rate mode : Variable Bit rate : 127 kb/s Maximum bit rate : 147 kb/s Channel(s) : 2 channels Channel layout : L R Sampling rate : 48.0 kHz Frame rate : 46.875 FPS (1024 SPF) Compression mode : Lossy Stream size : 105 MiB (3%) Language : German Default : Yes Alternate group : 1 Tagged date : UTC 2021-07-17 05:54:00 Audio #2 ID : 3 Format : E-AC-3 Format/Info : Enhanced AC-3 Commercial name : Dolby Digital Plus Codec ID : ac-3 Duration : 1 h 55 min Bit rate mode : Constant Bit rate : 256 kb/s Maximum bit rate : 270 kb/s Channel(s) : 6 channels Channel layout : L R C LFE Ls Rs Sampling rate : 48.0 kHz Frame rate : 31.250 FPS (1536 SPF) Compression mode : Lossy Stream size : 211 MiB (5%) Language : German Service kind : Complete Main Default : No Alternate group : 1 Tagged date : UTC 2021-07-17 05:54:00 Text ID : 4 Format : Timed Text Muxing mode : sbtl Codec ID : tx3g Duration : 2 h 20 min Bit rate mode : Variable Bit rate : 130 b/s Stream size : 134 KiB (0%) Language : German Default : Yes Forced : No Alternate group : 2 Tagged date : UTC 2021-07-17 05:54:00
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I noticed that the file outputted by mp4box is exactly 4.00 GiB large, is that maybe some sort of limit for mp4box?Originally Posted by davexnet
Unfortunately, as soon as ffmpeg "touches" my file, the subtitles become broken. I assume you are suggesting something like this?Originally Posted by davexnet
Then input2.mp4 does not seem to have working subtitles. I have extracted the subtitle files from both input.mp4 and input2.mp4 via "mp4box -raw 4" and attached them (or you can find them here: https://we.tl/t-Jww3LmqGN8)Code:ffmpeg -i input.mp4 -map 0 -c copy input2.mp4
Maybe somebody can see what the issue with the subtitles seems to be, because if I find a solution for that, I won't have to use mp4box for the cutting at all since ffmpeg does that just fine (save for the subtitles).Last edited by Fleand; 17th Jul 2021 at 19:55.
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There was this from 2016
https://github.com/gpac/gpac/issues/680
Quote
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