Hi,
I don't see anything wrong in your code.
What I would try:
1) Do not free AVIOContext right after your call to av_open_input(), keep it
until the end of the program.
2) From FFmpeg oxygen about avio_alloc_context() buffer param:
"The buffer must be allocated with av_malloc() and friends [OK], it may
be freed and replaced with a new buffer by libavformat [Ooops]".
I would double check the integrity (desired size) of your buffer at
each call, just to be sure.
Good luck.
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