[Libav-user] Writing frames into custom buffer

[Anton Shekhovtsov]

2017-09-27 14:35 GMT+03:00 Michael IV <explomaster at gmail.com>:

> Hi!
>  I want to accumulate results of av_interleaved_write_frame() in a buffer
> instead of a file.
>
>
> avformat_alloc_output_context2() file name parameter can be null. That
> probably means I should be
> able to access some internal buffer with the write frames?Or can I supply
> a custom buffer to write the frames to?
> Tnx!
>
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>
Something like this

  Buffer io;
  int buf_size = 4096;
  void* buf = av_malloc(buf_size);
  AVIOContext* avio_ctx = avio_alloc_context((unsigned
char*)buf,buf_size,1,&io,0,&Buffer::Write,&Buffer::Seek);
  AVFormatContext* ofmt = avformat_alloc_context();
  ofmt->pb = avio_ctx;
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