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  • Parsing FFMpeg AVPackets into h264 nal units

    9 février 2014, par BKC

    I am using FFMpeg To decode live video and stream it using Live555.i am able to decode video and getting the output AVPackets.
    1. Convert the BGR Image to YUV422P format using FFMpeg's SWScale

    // initilize a BGR To RGB converter using FFMpeg
    
ctx = sws_getContext(codecContext->width, codecContext->height, AV_PIX_FMT_BGR24, codecContext->width, codecContext->height, AV_PIX_FMT_YUV422P, SWS_BICUBIC, 0, 0, 0);
    
tempFrame = av_frame_alloc();
    
int num_bytes = avpicture_get_size(PIX_FMT_BGR24, codecContext->width, codecContext->height);
    
uint8_t* frame2_buffer = (uint8_t*)av_malloc(num_bytes*sizeof(uint8_t));
    
avpicture_fill((AVPicture*)tempFrame, frame2_buffer, PIX_FMT_BGR24, codecContext->width, codecContext->height);
    

    
// inside the loop of where frames are being encoded where rawFrame is a BGR image
    
tempFrame->data[0] = reinterpret_cast(rawFrame->_data);
    
sws_scale(ctx, tempFrame->data, tempFrame->linesize, 0, frame->height, frame->data, frame->linesize);

    For decoding each Frame

    ret = avcodec_encode_video2(codecContext, &packet, frame, &got_output);
    
if(ret < 0)
    
{
    
    fprintf(stderr, "Error in encoding frame\n");
    
    exit(1);
    
}
    

    
if(got_output)
    
{
    
    //printf("Received frame! pushing to queue\n");
    
    OutputFrame *outFrame = new OutputFrame();
    
    outFrame->_data = packet.buf->data;
    
    outFrame->_bufferSize = packet.buf->size;
    
    outputQueue.push_back(outFrame);
    
}

    Till here it works fine. i am able to write these frames to file and play it using VLC. after this i have to pass the output frame to Live555.i think AVPackets i am getting here doesn't need to be a single H264 Nal unit which is required by Live555.

    How to break a AVPacket into Nal units which can be passed to Live555 ?

  • hevc : support luma bit depth != chroma bit depth for PCM coding units

    14 décembre 2013, par Mickaël Raulet
    hevc : support luma bit depth != chroma bit depth for PCM coding units

    Signed-off-by : Anton Khirnov <anton@khirnov.net>
    • [DH] libavcodec/hevc.c
    • [DH] libavcodec/hevc.h
    • [DH] libavcodec/hevc_ps.c

  • FFMpeg getting too high fps

    23 février 2017, par user19283043

    Actual fps of video is 25 but keep getting 90 fps from ffmpeg.
    I’m not sure why it is detecting wrong framerate and if I set ’fps=40’, fps is even getting higher.

    This is my code of ffmpeg below :

    var cmd = ffmpeg()
    
      .input(data.img_path)
    
      .format('mp4')
    
      .videoCodec('libx264')
    
      .audioBitrate('48k')
    
      .audioChannels(2)
    
      .outputOptions('-movflags', 'frag_keyframe')
    
    .videoBitrate('1024k')

    Is there any way to fix this ?

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