[FFmpeg-user] Testing transcode speeds on Raspberry Pi 4

[Carl Eugen Hoyos]

Am Fr., 17. Apr. 2020 um 00:02 Uhr schrieb MediaMouth <communque at gmail.com>:
>
> > On Apr 16, 2020, at 2:26 PM, Carl Eugen Hoyos <ceffmpeg at gmail.com> wrote:
> >
> >> The following worked w/o errors (though it didn't improve the speed)
> >>        ffmpeg -y -i SourcePath -s 1280*720 -b:v 9000k -c:v h264_omx DestPath
> >>
> >> The following generated the "deprecated pixel format used" error.
> >
> > No.
> > ("deprecated pixel format used" is not an error.)
> >
> >>        ffmpeg -y -i SourcePath -b:v 9000k -c:v h264_omx DestPath
> >>
> >> The difference is the -s flag.  Why would leaving that out result in an error?
> >
> > I guess your hardware does not support 4k encoding.
>
> So you're saying the RPI seems capable of decoding 4k but not encoding.
> Did I get that correct?

I don't know.
But until not-so-long-ago, hardware encoding was limited to smaller
resolutions on more expensive gpu's, so I wonder if the rpi really
supports 4k encoding.
And it would be a good explanation for the behaviour you see.

Carl Eugen