Le 18 nov. 2009 à 14:23, Anatoliy Nenashev a écrit :
> Hi all!
> I need to solve the problem with memory usage by libavformat.
> Let us have the file test.avi which contains video in mpeg-2 format and audio
> in mp3 format.
> I want to read only audio stream from that file. Now I can do it with this
> code:
>
> int audio_stream_id;
> AVFormatContext *pFormatCtx;
> //open format context and get audio_stream id number
> //........
> AVPacket packet;
> while( 0 == av_read_packet(pFormatCtx, &packet) )
> {
> if (packet.stream_index == audio_stream_id)
> {
> //do something with audio packet ....
> }
> av_free_packet(&packet);
> }
> //close context
>
>
> I don't need video stream data but av_read_packet allocates memory for
> packet.data buffer which I need to deallocate by using av_free_packet. This
> is very bad for performance. Does anybody have any idea how to skip memory
> allocation for video stream buffer data?
Set the video stream discard field to AVDISCARD_ALL.
-- Jean-Daniel
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