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Sur d’autres sites (9249)

  • decoding AAC in ffmpeg android

    12 octobre 2012, par synthcat

    I am attempting to decode an M4A file on an Android device using AAC.

    I use the following code to initialize the codec.

    codec = avcodec_find_decoder(CODEC_ID_AAC);
    
c= avcodec_alloc_context();
    
avcodec_open(c, codec);

    However, when I later attempt to decode a frame using :

    len = avcodec_decode_audio3(c, (short *)mOutbuf, &out_size, &avpkt);

    I get -1 (indicating an error) and the following on the log.

    10-11 16:30:01.115 : INFO/M4ADecoder(5260) : channel element 0.0 is not allocated

    10-11 16:30:02.195 : INFO/M4ADecoder(5260) : channel element 2.0 is not allocated

    10-11 16:30:03.295 : INFO/M4ADecoder(5260) : channel element 0.6 is not allocated

    10-11 16:30:07.645 : INFO/M4ADecoder(5260) : Sample rate index in program config element does not match the sample rate index configured by the container.
    10-11 16:30:07.655 : INFO/M4ADecoder(5260) : Number of bands (3) exceeds limit (2).

    Are there any other steps I need to do when setting up the codec ? Do I need to preparse the file before sending data to the AAC decoder ?

    The same file works fine with the latest ffmpeg code on Mac OSX (i.e., ffmpeg -i filename.m4a").

    Thanks in advance for any help you can provide.

  • Decoding AAC in FFmpeg for Android

    13 octobre 2012, par synthcat

    I am attempting to decode an M4A file on an Android device using AAC.

    I use the following code to initialize the codec.

    codec = avcodec_find_decoder(CODEC_ID_AAC);
    
c= avcodec_alloc_context();
    
avcodec_open(c, codec);

    However, when I later attempt to decode a frame using :

    len = avcodec_decode_audio3(c, (short *)mOutbuf, &out_size, &avpkt);

    I get -1 (indicating an error) and the following on the log.

    10-11 16:30:01.115: INFO/M4ADecoder(5260): channel element 0.0 is not allocated
    
10-11 16:30:02.195: INFO/M4ADecoder(5260): channel element 2.0 is not allocated
    
10-11 16:30:03.295: INFO/M4ADecoder(5260): channel element 0.6 is not allocated
    
10-11 16:30:07.645: INFO/M4ADecoder(5260): Sample rate index in program config element does not match the sample rate index configured by the container.
    
10-11 16:30:07.655: INFO/M4ADecoder(5260): Number of bands (3) exceeds limit (2).

    Are there any other steps I need to do when setting up the codec ? Do I need to preparse the file before sending data to the AAC decoder ?

    The same file works fine with the latest ffmpeg code on Mac OSX (i.e., ffmpeg -i filename.m4a").

  • building static ffmpeg library for Android under windows 7

    29 mai 2013, par Zhenya

    I know that this has been asked several times, but I've never found any clear step by step and conclusive answer.

    How can I compile ffmpeg for Android, under windows 7 ?
    What are the steps ? Is there a project or wiki on the internet where to find this ?

    All I've found are steps to run under Ubuntu, or purely linux, but nothing to generate a static library for android, to be build under windows 7.

    Thanks

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