[FFmpeg-user] Confusion about quality parameters

Carl Eugen Hoyos ceffmpeg at gmail.com
Tue Jun 25 21:16:41 EEST 2019

Am Di., 25. Juni 2019 um 20:11 Uhr schrieb Ulf Zibis <Ulf.Zibis at gmx.de>:
> Am 25.06.19 um 15:04 schrieb Carl Eugen Hoyos:
> > Am Di., 25. Juni 2019 um 14:15 Uhr schrieb Ulf Zibis <Ulf.Zibis at gmx.de>:
> >
> >> my input is a 1.5 minute mp4 video with 19.5 MB
> >>
> >> When I use (with build from dev):
> >>     ./ffmpeg in.mp4 -c:a copy out.mp4
> > You do not specify an encoder here, mp4 defaults to x264.
> If I understand Moritz and my output correct, it's quite contrary:
> the dev build defaults to mpeg4.

In this case (your forgot to provide the complete, uncut console
output, so I had to guess) you have to provide either a constant
quantiser or a bitrate for the command line to produce useful
output (assuming state-of-the-art input as opposed to very low-res

Carl Eugen

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