[Libav-user] AVStream.discard vs av_open_input_stream()

Brian Fallik bfallik at bamboom.com
Tue Aug 16 15:38:17 CEST 2011


I have some code that uses libav* to read in mpeg-ts data and discard
certain streams based on their PID.  To discard I set:
  input_context->streams[i]->discard = AVDISCARD_ALL;
and then loop over the packets with

This works perfectly fine when I use av_open_input_file() to access
the data from a file on disk.  However, when I switch to using
av_open_input_stream(), av_read_frame() incorrectly returns the
packets for the discarded stream.

Anyone have any hints or thoughts on how I can fix this?  Am I doing
something wrong or is this a bug in ffmpeg?  I'd expect
av_open_input_stream() and av_open_input_file() to behave similarly
when operating on the same data.  The only difference is whether
ffmpeg reads from the file or from memory.


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