[FFmpeg-user] Howto specify needed options for ffmpeg

[Thomas Seilund]

On Thu, 24 Sep 2020 18:20:07 +0200
Carl Eugen Hoyos <ceffmpeg at gmail.com> wrote:

> Am Do., 24. Sept. 2020 um 16:18 Uhr schrieb Thomas Seilund via
> ffmpeg-user <ffmpeg-user at ffmpeg.org>:
> >
> >
> > On 9/23/20 10:42 PM, Carl Eugen Hoyos wrote:
> > > Am Mi., 23. Sept. 2020 um 17:24 Uhr schrieb Thomas Seilund via
> > > ffmpeg-user <ffmpeg-user at ffmpeg.org>:
> > >
> > >> Now I write to udp and not to a local file with this command:
> > >>
> > >> raspivid -t 0 -b 10000000 -n -o udp://239.255.42.42:5004
> > >> Connecting to 239.255.42.42:5004...connected, sending video...
> > >>
> > >>
> > >> On the same host I read from udp with this command - video is
> > >> never displayed
> > >>
> > >> ffplay -f h264 -i udp://239.255.42.42:5004
> > > In general, you should not force the input format.
> > >
> > > You should be able to record the udp stream with tcpdump,
> > > you can then investigate the output file.
> >
> > I will try to investigate. It was my idea to force the input format.
> 
> As you found out, this is not possible to the extent you wanted.
> 
> > How come that is not a good idea?
> 
> You may receive a different stream than what you expect, the
> auto-detection is meant to be very reliable.
> (This does not mean it cannot fail but you cannot work-around
> the issues you see with forcing the format.)
> 
> > >> ffplay version N-97152-g52523b6963 Copyright (c) 2003-2020 the
> > >> FFmpeg developers built with gcc 8 (Raspbian 8.3.0-6+rpi1)
> > >>    configuration: --extra-libs='-lpthread -lm' --enable-gpl
> > >> --enable-libass --enable-libfreetype --enable-libmp3lame
> > >> --enable-libvorbis --enable-libx264 --disable-doc
> > >> --enable-nonfree
> > > Is this binary distributed somewhere?
> > I used apt-get install on Raspberry Pi.
> 
> Where can I find the repository where you download this
> binary? Providing this binary for download is not allowed.
> 
I was wrong. Sorry. I must have compiled the version myself.
> Carl Eugen
> _______________________________________________
> ffmpeg-user mailing list
> ffmpeg-user at ffmpeg.org
> https://ffmpeg.org/mailman/listinfo/ffmpeg-user
> 
> To unsubscribe, visit link above, or email
> ffmpeg-user-request at ffmpeg.org with subject "unsubscribe".