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

[Gijs Peskens]

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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