jujulj a écrit :
> hi,
>
> I need to get the decoded samples from audio files of various formats
> using libavcodec.
> I've modified apiexample.c in order to detect automatically the
> appropriate codec, as shown in
> http://www.dranger.com/ffmpeg/tutorial03.c
>
> I replaced the following:
>
> <code>
>
> // find the mpeg audio decoder
> codec = avcodec_find_decoder(CODEC_ID_MP2);
> if (!codec) {
> fprintf(stderr, "codec not found\n");
> exit(1);
> }
>
> c= avcodec_alloc_context();
>
> </code>
>
>
> by this:
>
> <code>
>
> AVFormatContext *pFormatCtx;
> int i, audioStream;
>
> // Open audio file
> if(av_open_input_file(&pFormatCtx, filename, NULL, 0, NULL)!=0) {
> printf("Couldn't open file\n");
> return -1;
> }
>
> // Retrieve stream information
> if(av_find_stream_info(pFormatCtx)<0)
> return -1; // Couldn't find stream information
>
> // Dump information about file onto standard error
> dump_format(pFormatCtx, 0, filename, 0);
>
> // Find the first audio stream
> audioStream=-1;
> for(i=0; i<pFormatCtx->nb_streams; i++) {
> if(pFormatCtx->streams[i]->codec->codec_type==CODEC_TYPE_AUDIO
> && audioStream < 0) {
> audioStream=i;
> }
> }
>
> if(audioStream==-1)
> return -1;
>
> c=pFormatCtx->streams[audioStream]->codec;
>
> </code>
>
> in apiexample.c (I also included avformat.h of course).
>
> My problem is that it does not even open the file, i.e.
>
> <code>
>
> av_open_input_file(&pFormatCtx, filename, NULL, 0, NULL) do not return 0
>
> </code>
>
> do not return 0.
>
> The original code (i.e. hardcoding codec =
> avcodec_find_decoder(CODEC_ID_MP2);) works...
>
> Is this the right way to do what I want to achieve?
>
> apiexample_modified.c is attached.
>
> thank you
>
> Jul
>
> ------------------------------------------------------------------------
>
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in tutorial, he used av_register_all. Couldn't see it in your main()
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