[theora] Live Streams

Benjamin M. Schwartz bmschwar at fas.harvard.edu
Tue Jan 5 08:42:01 PST 2010

Gregory Maxwell wrote:
> On Mon, Jan 4, 2010 at 11:49 PM, iMDT - Tiago Jacobs <tiago at imdt.com.br> wrote:
>>    -> Is the format tolerant to lost frames?
> Not especially

The loss tolerance of Theora itself is similar to every other mainstream
video codec: a lost packet will screw up the video until the next
keyframe.  However, the overall loss tolerance of the format also depends
on the container system.

Theora can be transmitted in RTP, and there is a standard for Forward
Error Correction (FEC) in RTP.  Using this system, it should be possible
to achieve excellent resilience to packet loss, at the cost of increased
bandwidth usage.  However, in the case of low-latency video, the extra
bandwidth and buffering needed for FEC is generally seen as a major
disadvantage, and so FEC is rarely used in this case.


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