Flash Video Encoding Bit Rate
Hi All,
I have been working with Flash video telephony for many years now and its great to see AEC, AGC (acoustic gain control), UDP and H264 have arrived.
I spend much time simulating network conditions and devising algorithms which can produce video quality equal to Skype.
There are plenty of stats availabile (packet loss, in/outbound bit rate, frames dropped and so on) BUT....
The big issue is the inability for the flash video encoder(s) (H264 seems no better) to obey the target bit rate.
Rather than address this I believe Flash chooses to drop frames when it detects issues in local upload congestion.
However the ability to match the receivers download requirements is not possible. The encoder frequently bursts way above the configured bit rate resulting in packets loss or latency (UDP vs TCP). We end up having to go well below the target bit rate to compensate and take in to account that the higher the encoding quality the more likely flash is to burst over the specified rate. The whole effort is wasted unless this is addresses and Flash 11/H264 is worse than before.
If we have grossly overlooked something or you would like to see a link to a working example of the problem please let me know.
Kind Regards
Ben Weekes
CTO Requestec
Hi Ben
Could I see a link to a working example please?
Thank in advance,
Pablo
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