The avformat consumer sets up a 1MB buffer for encoded video frames - 
unfortunately this can be too small in some circumstances - for example 
when using x264 lossless output.

Doubly unfortunately ffmpeg will overrun the supplied buffer - it is 
possible to check the return values from avcodec_encode_video but by 
then it's too late as memory past the end of the buffer will have been 
corrupted

Is it possible to increase the buffer size as a short term measure to 2MB?

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