I can only respond to question (1), and the answer is yes, but you must define your own lock manager. See https://stackoverflow.com/questions/13888915/thread-safety-of-libav-ffmpeg for more details. There are a few particular methods that have thread safety concerns. IIRC, writing frames is one. Opening a codec is also not thread safe: https://stackoverflow.com/questions/15366441/ffmpeg-which-functions-are-multithreading-safe
HTH, Michael On Wed, Feb 27, 2019 at 5:55 AM BIGLER Don (Framatome) < [email protected]> wrote: > All, > > > > I am writing an application that displays, encodes, and muxes live video > using libav as the backend. The audio and video encoding occurs > asynchronously in the background, each in its own thread, such that the > encoded packets arrive to the av_interleaved_write_frame() function call at > different times. H.264 video encoding by itself works fine. However when > I add audio, the audio is out of sync from the video even though the audio > and video pts are in sync (from avdevice using the matroska muxer). The > cause of the problem is not clear to me. Specifically, here are my > questions: > > > > 1. Can the av_interleaved_write_frame() function handle multithreaded > asynchronous calls for audio and video streams? > > 2. The transcoding example uses a filter graph using buffer/abuffer > filters. My current implementation does not use the buffer/abuffer filters > because I am not applying any filters before encoding. Are they required > for my situation? > > 3. The encoding happens randomly within the stream such that the > first pts received by the muxer is not zero. Is this required? > > > > I will greatly appreciate any assistance! > > > > Regards, > > Don Bigler > > > _______________________________________________ > Libav-user mailing list > [email protected] > https://ffmpeg.org/mailman/listinfo/libav-user > > To unsubscribe, visit link above, or email > [email protected] with subject "unsubscribe".
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