[FFmpeg-devel] How to implement pcap ffmpeg format?

[sonntex]

It might be interesting. I didn’t find how to pass rtp to ffmpeg stdin.
That is why I started thinking about pcap.

Could you please show an example?

On Wed, 22 Feb 2023 at 08:04, Gijs Peskens <gijs at peskens.net> wrote:

> Wouldn't the simplest solution just be a tiny tool that unwraps the pcap
> stuff and just passes the packet data out on stdout?
> That's assuming ffmpeg allows receiving RTP packets on stdin.
>
> On 21-02-2023 23:55, sonntex wrote:
> > New pcap ffmpeg format can have all options rtpdec requires.
> >
> > Anyway, I don't suggest you implement this feature. I just want to find a
> > good entry point to start coding personally.
> >
> > I need to create a development tool for rtp tracing, and pcap files seem
> a
> > good idea because I can grab rtp using tcpdump, or create pcap files
> > directly in my application, or whatever. It's better then wrap vp8/vp9 to
> > ivf or h264 to byte stream and pass it to ffmpeg via pipe because it
> > doesn't require coding of new solutions for every video and audio formats
> > transferring over rtp.
> >
> > On Tue, Feb 21, 2023 at 10:38 PM Kieran Kunhya <kierank at obe.tv> wrote:
> >
> >> On Tue, 21 Feb 2023, 22:33 sonntex, <sonntex at gmail.com> wrote:
> >>
> >>> I want to implement something which helps me to play rtp stored in pcap
> >>> files.
> >>>
> >>> tcpdump -i lo udp port 50000 -s0 -w - | ffplay <codec options> -i -
> >>>
> >>> The specification of pcap files is really simple and I could create a
> new
> >>> ffmpeg format, but don't know how to process rtp packets extracted from
> >>> pcap, because it seems that all functions for rtp parsing are private.
> >>>
> >>> Need a good example of inner ffmpeg formats processing.
> >>>
> >> How is ffmpeg meant to know the meaning of the contents of a pcap and
> the
> >> format inside?
> >>
> >> This is a very bad idea.
> >>
> >> What's next, ffmpeg implementing userspace TCP? Are we going to add
> support
> >> for parsing filesystems as well?
> >>
> >> Regards,
> >> Kieran Kunhya
> >>
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