Hello All:
Just recently I have been testing ffmpeg library (Not OSG's ffmpeg
plugin) use within some tools we are doing. Over the past couple of
days we have been hammering video in a multi threaded environment and
it has come to our attention that ffmpeg is not thread safe. I have
not locked down where in ffmpeg it uses global structures besides the
registerall calls. In our code we had to do a shared mutex lock on
all calls to the ffmpeg library. So for instance a call to
avcodec_open could fail if you are doing a code decode at the same time.
Example:
When we were grabbing a frame from one file and opening another file
the open could fail which gave strong indication of shared global data
within ffmpeg. After lock down with a comon critical section mutex we
were able to use the ffmpeg in a multi threaded environment.
I wanted to pass this along because I have seen the ffmpeg plugin
added to OSG.
If anyone knows the exact API calls or found docs specifying the exact
calls in ffmpeg library that is not thread safe please pass it along.
For now, I have just wrapped all calls as critical and everything
works robustly in a multi threaded environment.
Take care
Garrett
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