[FFmpeg-devel] Splitting libavformat (Was: [PATCH] IPv6 support v.2)

Michel Bardiaux mbardiaux
Fri Nov 16 16:09:35 CET 2007

Luca Abeni a ?crit :
> Hi Michel,
> Michel Bardiaux wrote:
>>> http://thread.gmane.org/gmane.comp.video.ffmpeg.devel/57997/focus=58158
>>> It should make possible to "grab" not only from physical devices but
>>> also from automatic pattern generators, which would be useful for
>>> testing/debugging (not to mention the coolness of having a psychedelic
>>> pattern video/audio generator).
>> There is no need to add that *in* libavformat. There is the vloopback 
>> device for such effects.
> This is an interesting idea... Do you know about a similar loopback device
> for audio? 

Alas, no! I have been looking for such a device for days now, and havent 
found any yet.

I already use a vlc plugin I have written to decode video from a TS, 
give it to vloopback, then use a TV-grabber designed for TV-boards. That 
works well, so I consider it a proof-of-concept, and would love to do 
the same for audio.

Note that I am quite unfamiliar with ALSA devices, so maybe there is 
something in alsa...

> If it exists, we can generate audio/video test patterns for
> testing A/V synch issues (that would be very useful for my streaming tests :)

Good idea!

Michel Bardiaux
R&D Director
T +32 [0] 2 790 29 41
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