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• Muxing encoder output with custom io in ffmpeg

  3 mai 2021, par MisterSincere

  I am having some basic issues on how to mux my encoder results into a mp4 file. My current approach is to create a custom AVFormatContext, where the DataProvider is the encoder :

  


  AVFormatContext *create_format_context(DataProvider *pDataProvider) {
  AVFormatContext *ctx{avformat_alloc_context()};

  size_t   bufSize{8 * 1024 * 1024};
  uint8_t *avBuffer{(uint8_t*)av_malloc(bufSize)};

  ctx->pb = avio_alloc_context(avBuffer,
                               bufSize,
                               0,
                               pDataProvider,
                               DataProvider::read,
                               nullptr,
                               nullptr);

  ctx->flags |= AVFMT_FLAG_CUSTOM_IO;

  FFMPEG_CALL(avformat_open_input(&ctx, nullptr, nullptr, nullptr));
  return ctx;
}


  


  But I crash on avformat_open_input with the following error message :

  


  


  Invalid data found when processing input

  


  


  It tries to read for the first time from the encoder, but since this is at init-time, the encoder doesn't have any results yet. I figured the problem is that ffmpeg tries to query for some header informations, since it would feel weird to ask for actual data when just opening.
  
How do I provide that header information / where can I learn something about how this header should look like and what else I need to provide for ffmpeg ?
  
Or is there even a completely different approach, because quite honestly I would be happy if I could feed the per frame encoded data directly to ffmpeg instead of through this whole context abstraction.

  


  For context I pasted the muxer class, I guess the progress() function is the most interesting one, here header, source.

  


  Also I call the kinda magic functions

  


  av_register_all();
avcodec_register_all();
avformat_network_init();


  


  before everything else concerning ffmpeg.

  


  The encoder is not written with ffmpeg, but with cuda / the nvidia video sdk for hardware acceleration purposes.

  


• avfilter/graphparser : add ’\r’ as whitespace

  6 mai 2016, par Muhammad Faiz

  avfilter/graphparser : add ’\r’ as whitespace
  for compatibility with platforms that treat it
  
  as newline
  Signed-off-by : Muhammad Faiz <mfcc64@gmail.com>
  

  • [DH] libavfilter/graphparser.c
  • [DH] libavfilter/version.h

• avfilter/avf_showcqt : add performance debugging log

  6 mars 2016, par Muhammad Faiz

  avfilter/avf_showcqt : add performance debugging log
  for easier development
  Signed-off-by : Muhammad Faiz <mfcc64@gmail.com>
  

  • [DH] libavfilter/avf_showcqt.c
  • [DH] libavfilter/avf_showcqt.h