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slice or frame based multi-threading libavcodec

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anoop bhagyanath
slice or frame based multi-threading libavcodec
on Feb 7, 2012 at 12:53:55 pm

hello,

i was trying to understand the level of parallelization implemented in ffmpeg libavcodec decoding h264 coded video files. i see decoding happening parallelly at frame level and slice level, with the number of threads limited to (number of cores + 1). but i could not figure out how they decide which level of parallelization to use for any video file. i find that the decision is taken based on the value of codeccontext->active_thread_type. but where is this parameter set ? please let me know if anyone is aware of this.

thank you,
bhagya


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