[FFmpeg-devel] Match source video timestamp

Eran Kornblau eran.kornblau at kaltura.com
Sun Apr 30 18:19:37 EEST 2017

> -----Original Message-----
> From: ffmpeg-devel [mailto:ffmpeg-devel-bounces at ffmpeg.org] On Behalf Of Carl Eugen Hoyos
> Sent: Sunday, April 30, 2017 2:18 PM
> To: FFmpeg development discussions and patches <ffmpeg-devel at ffmpeg.org>
> Subject: Re: [FFmpeg-devel] Match source video timestamp
> 2017-04-30 13:09 GMT+02:00 Eran Kornblau <eran.kornblau at kaltura.com>:
> >> I'm trying to transcode some video file (MP4/h264 baseline vfr/AAC) 
> >> with ffmpeg, and I would like to have the frame timestamps in the 
> >> transcoded file perfectly match the source video.
> Why does this not work with -copyts?
I don't really understand what this setting is supposed to do, it is referenced in a few very long ifs...
But what I can say is that it does not affect the encoder time base, and that's what's causing the
problem I'm having (the encoder time base is set too low, so that it quantizes the timestamp values)
There's also -copytb, but from what I see it is only used in stream copy mode, while I'm doing encoding.

> Carl Eugen
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