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  • encoding by using ffmpeg library

    22 août 2013, par Mustafe

    I am currently developing an application by using ffmpeg library. I have a problem with encoding pcm/raw datas. In ffmpeg/encoding_decoding.c source code, at line 146 in this function :

    buffer_size = av_samples_get_buffer_size(NULL, c->channels, c->frame_size, c->sample_fmt, 0);

    buffer_size is being calculated. My function always returns -22 which states an error. After a little examanation I noticed that in line 1888 at avcodec.h it is stated as following which shows the reason. Since CODEC_CAP_VARIABLE_FRAME_SIZE is set my function returns -22 and my program terminates. In this case the encoding code example in ffmpeg's website also could not work. How can I solve this problem ?

    encoding: set by libavcodec in avcodec_open2(). Each submitted frame except the last must contain exactly frame_size samples per channel. May be 0 when the codec has CODEC_CAP_VARIABLE_FRAME_SIZE set, then the frame size is not restricted. decoding: may be set by some decoders to indicate constant frame size

  • bytestream : Make get_bytes_left compatible with overread

    14 décembre 2019, par Andreas Rheinhardt
    bytestream : Make get_bytes_left compatible with overread

    bytestream2_get_bytes_left returns an unsigned int ; as a result,
    
it returns big positive numbers if an overread already happened,
    
making it unsuitable for scenarios where one wants to allow this
    
in a controlled way (because the buffer is actually padded so that
    
no segfaults can happen). So change it to return an ordinary int.
    

    Also, bytestream2_get_bytes_left_p has been modified in the same way.
    

    Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
    
Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
    • [DH] libavcodec/bytestream.h

  • ffmpeg + play video loop

    3 septembre 2013, par Javier Ramírez

    Does anyone know how to make a video using ffmpeg + Opengl play continuously ?. Because this is only played once

    tiempo = glfwGetTime();
    
duracion = 1.0/25.0; // 1 second / 25 fps
    

    
while(1){
    

    
...        
    

    
  if(glfwGetTime() > tiempo + duracion){
    
    if(av_read_frame(pFormatCtx,&amp;packet) >= 0){
    
      if(packet.stream_index == 0){
    
        avcodec_decode_video2(pCodecCtx,pFrame,&amp;frameFin,&amp;packet);
    
        if(frameFin)sws_scale(img_convert_ctx,pFrame->data,pFrame->linesize,0,pCodecCtx->height,pFrameRGB->data,pFrameRGB->linesize);
    
      }
    
      av_free_packet(&amp;packet);
    
    }
    
    tiempo += duracion;
    
  }
    

    
...
    

    
}

    I know av_read_frame function (...) returns 0 if the end of file. But how do I make the function again returns a value other than zero ? o How I can I make the video is constantly repeated ?

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