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

sonntex sonntex at gmail.com
Wed Feb 22 00:55:02 EET 2023

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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