[FFmpeg-user] splitting up video with high quality (HDR, 4k, Dolby Atmos+ TrueHd)

[Paul B Mahol]

On Tue, Nov 21, 2023 at 12:49 AM Sebbi Thueni <sebastianthuener99 at gmail.com>
wrote:

> Hi I have a question regarding a command in ffmpeg. I have a relatively
> high quality video as test.mkv which has a 4k quality and hdr. additionally
> it has a truehd dolby atmos audio. so lossless and uncompressed. i'm trying
> to cut the video into small snippets of 5 s now. the background is that i
> can play this video better as video on demand as m3u8. if i use this :
> ffmpeg -i test.mkv -f segment -segment_time 5 test%d.mkv
> the desired result does not come out. ffmpeg turns the audio into sound in
> vorbis. which no longer offers the quality of a pure atmos truehd sound.
> but if i just copy the sound and the video with:
> ffmpeg -i test.mkv -c:v copy -c:a copy -f segment -segment_time 5
> test%d.mkv
> or
> ffmpeg -i test.mkv -c:v copy -c:a truehd -f segment -segment_time 5
> test%d.mkv
> or
> ffmpeg -i test.mkv -map 0:v -c:v copy -map 0:a -c:a copy -f segment
> -segment_time 5 test%d.mkv
> ffmpeg -i test.mkv -map 0:v -c:v copy -map 0:a -c:a truehd -f segment
> -segment_time 5 test%d.mkv
> the sound is not played in all segments. The video is always flawless. My
> question now is if someone can help me to get these segments to work.
> because theoretically it is just a copy of everything and always cut off
> after a few seconds.
>

Version of ffmpeg?


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