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I am using this Video-List:

file 'C:\Users\X\Documents\test\input.mp4' inpoint 00:00:02.7650000 outpoint 00:00:04.7650000

and the following Command:

ffmpeg -y -safe 0 -f concat -i output.txt -map 0:v -map 0:a -c:a copy -c:v copy output.mp4

which should result in a Video with 2 Seconds in Length. But if I do a check with ffprobe I get this:

Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'output.mp4': Metadata: major_brand : isom minor_version : 512 compatible_brands: isomiso2avc1mp41 encoder : Lavf60.16.100 Duration: 00:00:04.85, start: 0.000000, bitrate: 394 kb/s Stream #0:0[0x1](und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709, progressive), 1920x1080 [SAR 1:1 DAR 16:9], 382 kb/s, 30 fps, 30 tbr, 15360 tbn (default) Metadata: handler_name : VideoHandler vendor_id : [0][0][0][0] Stream #0:1[0x2](und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 2 kb/s (default) Metadata: handler_name : SoundHandler vendor_id : [0][0][0][0]

Whats the cause of this?

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As explained in the documentation, the inpoint directive works best with intra frame codecs, because for non-intra frame ones you will usually get extra packets before the actual In point and the decoded content will most likely contain frames before In point too.

And it's the same problem for outpoint directive.

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  • Okay so to make it work with the Videos I have I should use ffmpeg to re-render them using a intra-frame codec? Right? Commented Feb 12, 2024 at 14:02
  • @Snickbrack Yes. For example : ffmpeg -i input -c:v libx264 -g 1 output Commented Feb 12, 2024 at 14:11

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