[FFmpeg-user] Problems with old TV - Can I decode a new file and re-encode to an older version of a codec?

[Paul B Mahol]

On Fri, May 31, 2024 at 5:18 PM bbb <ffmpeg-user at bugblatterbeast.de> wrote:

> On 5/31/24 17:10, Reindl Harald wrote:
> >
> >
> > Am 31.05.24 um 15:50 schrieb bbb:
> >> On 5/31/24 15:16, Reindl Harald wrote:
> >>> your command is very unspecific to begin with
> >>> even profile is missing
> >>>
> >>> https://trac.ffmpeg.org/wiki/Encode/H.264
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> >>
> >> Thank you for the info and the link!
> >>
> >> It has been working fine so far with just that command (I can't
> >> remember where I got it from)
> >
> > well, so it's completly random what is falling out - no codec options
> > specified, no quailty options - basicaly you are telling ffmpeg "do
> > whatever you want"
> >
> >> Seems like profile is defaulting to "high".
> >>> Stream #0:0(eng): Video: h264 (High), yuv420p(tv, bt709,
> >>> progressive), 1920x1080 [SAR 1:1 DAR 16:9], 23.98 fps, 23.98 tbr, 1k
> >>> tbn (default)
> >
> > which is maybe a problem - at least some years ago anything but
> > baseline was a problem on many devices including iPhone
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>
> Yes, thanks. I didn't realise that.
>
> My players say it's exactly the same codec and doesn't show a
> difference. But when inspecting the files with ffprobe, it seems that
> yuv420p(progressive) is working fine and either one or both of the
> options "tv" and "bt709" seem to be causing the problems.
>


That have nothing to do with encoder settings.


>
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