[FFmpeg-devel] [PATCH] ffmpeg: Don't offer H.264 compatibility warning for NV12 input

[Gyan]

On Thu, Jun 15, 2017 at 4:59 AM, wm4 <nfxjfg at googlemail.com> wrote:

>
> >              av_log(NULL, AV_LOG_WARNING,
> >                     "No pixel format specified, %s for H.264 encoding
> chosen.\n"
> >                     "Use -pix_fmt yuv420p for compatibility with
> outdated media players.\n",
>
> This warning shouldn't exist in the first place. It's dumb and
> incorrect.
>

It could (and should) be better worded but it's needed. There's a
semi-regular influx of questions at the SE sites where users complain about
their ffmpeg output having audio but 'no video' or having a video stream
which only plays in certain players. I can only imagine that the presence
of the warning cuts down on the frequency of those queries, but also
there's likely a countervailing effect by the use of the term 'outdated'
which implies that if one has a recent version of a player, this warning
can be ignored.  When, in fact, browser-based players don't decode anything
other than yuv420p , whichever version, and same's the case for many
players on WIndows, including atleast WMP on Win7.