[FFmpeg-devel] ffm synchronization when using ffserver on revision 11463
Tue Jan 8 19:51:16 CET 2008
I have written an application that encodes synthesized video and provides
it to ffserver in a similar manner to ffmpeg. However, I've noticed
synchronization errors while reading ffm data. I've attached a patch to
address these issues, and I'm looking for feedback.
One issue occurs when reading the first header, when encountering a frame
that does not include an offset in the initial packets. A frame header can
not be found, and the ffm_read_data returns 0. However, the FFMContext
pointers are not reset, so the ffm_read_data succeeds on a subsequent
read, regardless of whether the header is next to be read. I've reset the
FFMContext pointers upon this case, which appears to handle this case.
The other issue is a loss of synchronization when ffserver is under load.
Essentially, the size to be read does not align with the next header, as
indicated between a mismatch of offset and size. I've spent days trying to
understand why synchronization can be lost, so I'm hoping someone here
will have some insight into the root cause. My patch only addresses the
symptom, by trapping and recovering from the loss of synchronization.
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