[SOLVED] [ffmpeg] Right way to move audio by 0.2s?

[yetanotherlogin]

Hello

I googled before asking but am still not sure how to doctor a video where the audio is slighty late and must be advanced by 0.2s:

    Stream #0:0(eng): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 640x426 [SAR 213:176 DAR 20:11], 759 kb/s, 20 fps, 20 tbr, 10240 tbn, 40 tbc (default)

    Stream #0:1(eng): Audio: aac (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 128 kb/s (default)

Is the following command the right solution?

ffmpeg -i input.mp4 -itsoffset 0.2 -i input.mp4 -map 0:0 -map 1:1 -vcodec libx264 -r 20 -b:v 300k -acodec copy -f mp4 output.mp4

Ideally, I'd like to avoid introducing yet more loss by re-encoding.

Thank you.

---
Found it:

ffmpeg -i input.mp4 -itsoffset 0.2 -i input.mp4 -map 0:0 -map 1:1 -c copy -f mp4 output.m4

[Baldrick]

Thanks for posting the solution...

[pandy]

https://www.ffmpeg.org/ffmpeg-filters.html#setpts_002c-asetpts

seem to be more appropriate

Apply an offset of 10 seconds to the input PTS:

setpts=PTS+10/TB

so asetpts=PTS+0.2/TB should work (less complex ffmpeg syntax)

[yetanotherlogin]

I guess setpts is a more recent option.