I've just been hunting down a bug in one of our programs, and I tracked it down to the number of channels reported by ffmpeg. When I first open the AVFormatContext and do avformat_find_stream_info(), I can see that my audio stream's AVCodecContext has a reported channel_layout of 3 (stereo) and channels == 2. However, when I call avcodec_open2() to start decoding, it changes the streams' AVCodecContext channel info so that channel_layout is 4 (mono) and channels == 1! This is causing a crash in a later part of the program, as one part of the program expects two channels and the other part expects 1 channel.
Two questions: 1) Is this "expected behavior" in any case, or is it a bug? 2) Under what situations does avcodec_open2 change the channel info? FYI, I'm opening an MP4 with AAC audio, and I am using FFmpeg 1.0. I can provide more details, of course, but I'd at least like to know whether or not avcodec_open2 can change the channel info under certain circumstances. I've looked at the source of it and there isn't anything I see that would change both the channel count and channel layout. Thanks, Michael _______________________________________________ Libav-user mailing list [email protected] http://ffmpeg.org/mailman/listinfo/libav-user
