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Sur d’autres sites (7874)

  • FFmpeg H264 encoder and Mediacodec AVC decoder bitstream format mismatch

    24 octobre 2023, par danvik13

    I have 2 apps : desktop and android part.
On desktop side I encode video using AVCodec H264 encoder and, then, send it to phone via net.
On the android side I receive a sequence of video packets and need to decode them from java code using MediaCodec AVC decoder

    


    The issue : according to Google docs, the decoder should be fed with two initial packets : csd-0 and csd-1, holding sps and pps accordingly. However, ffmpeg does not provide both of them. When I set AV_CODEC_FLAG_GLOBAL_HEADER, it forces the encoder to place initial data to the extradata field. But there is just one of the arrays

    


    Does AVC Mediadecoder guarantees that it will parse extradata bytes properly in case I will send them as a csd-0 buffer, ignoring csd-1 ?

    


    I know that extradata splitting can be done manually, but it is a bit weird that there is no clear way in ffmpeg to meet the bitstream format, required by Mediadecoder

    


    Explanation / solution / code snippets

    


  • ffmpeg and H264 confusion [closed]

    31 mai 2013, par Zhenya

    I am new in video encoding, and just starting to learn now. I am confused about the ffmpeg and H264

    • What are the differences of these ?
    • Is ffmpeg the encoder and H264 the
      codec ?
    • Is it possible to use H264 without ffmpeg or ffmpeg must be
      always used for encoding ?
    • Is there an alternative to ffmpeg ?

    Thanks

  • avdevice_capabilities_create This function is deprecated, what should I replace it ?

    24 juin 2024, par 中野梓喵

    I wanted to get the support information about the device as a string, but this function was completely abolished in ffmpeg 6

    


    int     avdevice_capabilities_create (AVDeviceCapabilitiesQuery **caps, AVFormatContext *s, AVDictionary **device_options)
void    avdevice_capabilities_free (AVDeviceCapabilitiesQuery **caps, AVFormatContext *s)



    


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