[Red5] Audio/Video Live Streaming
jojo at struktur.de
Wed Mar 22 11:29:59 EST 2006
Hi Kai and Raimund,
Kai Londenberg wrote:
> Raimund Kaemmerer wrote:
>>right now I am playing around with a Live Audio/Videochat application
>>using Red5. Putting both Audio & Video on a Stream gives me huge
> Raimund and I work together, so I'm adding a few clarifications and
> comments myself here:
> - The A/V Stream seems to get buffered somewhere (server or client) -
> and after a while, the receiver lags behind the sender.
> - This lag went up to more than 2 minutes after 5 minutes of A/V Chat or
> so over a DSL Line.
> - The desynchronization happened in our internal LAN (1Gbit Ethernet) as
> well, although not as severely compared to the DSL Line.
> - The video quality can degrade a lot if Audio and Video are played at
> - All client buffers have been set to 0, audio quality has been set to
> 22 khz, and video quality to max (at 100x100px resolution).
> - If audio is emitted from the app, the video never desynchronizes by
> more than 1 or 2 seconds.
Is the lag between the audio and the video or between the broadcaster
and the subscribers?
> What I'd like to know is, what would happen if we just drop one or the
> other RTMP Packet in a Video Stream. Would that video stream
> need to be resynchronized (by sending a complete Keyframe) or is it
> possible to simply drop some (RTMP, not IP) packets server-side in order
> to do rate limiting ?
Flow control for streams is scheduled for the 0.5 release, Steven is
currentlz working on refactoring the streaming code so this will be
supported in the future.
> Or put another way: Does the Video Stream consist of complete keyframes,
> does it just stream the difference from one frame to the other, or
> does it a mixture of those two ? How about Audio Streams ?
Currently Red5 passes the received data unmodified to the subscribing
clients. It contains periodic keyframes with delta frames inbetween
for video streams. I don't know the encoding of audio streams.
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