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• ffmpeg buffer not released

  11 mars 2013, par ByteByter

  So, I have written a basic decoder for ffmpeg that simply reads the input frames pixel data (Stored using RGB 8 format), and places it directly into the output buffer. (Also RGB 8) The problem is that when I use this decoder in ffmpeg, it says that there is 1 unreleased buffer.(Tested using ffmpeg -i Test.utah Test.png). Unfortunately, I am unsure of what buffer it is talking about, as I am not creating my own buffer. I have tried releasing the AVContext's coded_frame buffer in my decoders closing method, but this causes segmentation faults.

  Any help would be greatly appreciated.

  static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
  
  {
  
      int ret;           /*Hold return from get_buffer */ 
  
      int skipSize;      /*Number of dummy bytes to skip per line*/
  
      int fseek=8;       /*Location of the first pixel*/
  
      int i=0; int j=0;  /*Output buffer seek index/Input Buffer seek index*/
  
      const uint8_t *buf = avpkt->data; /*Hold a pointer to the input buffer*/
  
      AVFrame *pict=data; /*Hold a pointer to the output buffer*/
  
  
  
      /*Set the output pixel format to RGB8*/
  
      avctx->pix_fmt = AV_PIX_FMT_RGB8;
  
  
  
      /*Get the width and height*/
  
      bytestream_get_le32(&buf);
  
      avctx->width=bytestream_get_le16(&buf);
  
      avctx->height=bytestream_get_le16(&buf);
  
  
  
      /*Release the old buffer*/
  
      if (pict->data[0]) avctx->release_buffer(avctx, pict);
  
  
  
      /*Aquire a large enough data buffer to hold the decompressed picture*/
  
      if (ret=ff_get_buffer(avctx, pict) < 0) return ret;
  
      skipSize=pict->linesize[0] - avctx->width; 
  
  
  
      /*Transfer input buffer to output buffer*/
  
      for(int y=0;yheight;y++){
  
          for(int x=0;xwidth;x++){
  
              pict->data[0][i]=avpkt->data[fseek+j];
  
              j++;
  
              i++;
  
          }
  
          i+=skipSize;
  
      }
  
  
  
      /*Inform ffmpeg the output is a key frame and that it is ready for external usage*/
  
      pict->pict_type        = AV_PICTURE_TYPE_I;
  
      pict->key_frame        = 1;
  
      *got_frame=1;
  
      return 0;
  
  }

• avcodec/mpegpicture : Decrease size of encoding_error array

  10 janvier 2022, par Andreas Rheinhardt

  avcodec/mpegpicture : Decrease size of encoding_error array
  The current size is AV_NUM_DATA_POINTERS (i.e. eight).
  
  This number is chosen in order to minimize the amount of allocations
  
  for AVFrame.extended_(data|buf) for audio ; it is meaningless
  
  for video for which four is sufficient. So decrease this array
  
  in order to minimize what is copied in ff_mpeg_ref_picture()
  
  and at the places that copy a whole MpegEncContext.
  Also do the same for snowenc.
  Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
  

  • [DH] libavcodec/mpegpicture.h
  • [DH] libavcodec/mpegvideo_enc.c
  • [DH] libavcodec/snow.h
  • [DH] libavcodec/snowenc.c

• Can stream to Facebook using ffmpeg but not when using tee

  16 mai 2017, par MazeHatter

  I’m trying to stream to YouTube and Facebook simultaneously using ffmpeg.

  I can do them individually, but I want to use "tee" to send the results of encoding to two places.

  If I do :

  ffmpeg -re -i pipe:0 -acodec libfdk_aac -bsf:a aac_adtstoasc \
  
      -ar 44100 -b:a 128k -pix_fmt yuv420p -profile:v baseline \
  
      -s 720x480 -bufsize 2048k -vb 1300k -maxrate 4000k -deinterlace \
  
      -vcodec libx264 -g 25 -r 25 \
  
      -f flv "rtmp://rtmp-api.facebook.com:80/rtmp/key"

  It works just fine.

  But if I do :

  ffmpeg -re -i pipe:0 -acodec libfdk_aac -bsf:a aac_adtstoasc \
  
      -ar 44100 -b:a 128k -pix_fmt yuv420p -profile:v baseline \
  
      -s 720x480 -bufsize 2048k -vb 1300k -maxrate 4000k -deinterlace \
  
      -vcodec libx264 -g 25 -r 25 \
  
      -f tee -map 0:v -map 0:a \
  
      "[f=flv]rtmp://rtmp-api.facebook.com:80/rtmp/key"

  Then I get a rtmp 104 error.

  If that would work then I could just do :

          "[f=flv]rtmp://rtmp-api.facebook.com:80/rtmp/key|[f=flv]rtmp://youtube.etc"

  And that would stream to both.

  I did find out that I needed "-bsf:a aac_adtstoasc" otherwise the encoder broke, complaining about malformed bits.

  Any ideas ?

  The error is only with Facebook. YouTube works fine.

  Console output :

    Metadata:
  
      encoder         : Lavf57.72.101
  
      Stream #0:0: Video: h264 (libx264), yuv420p, 720x480 [SAR 8:9 DAR 4:3], q=-1--1, 1300 kb/s, 29.97 fps, 29.97 tbn, 29.97 tbc
  
      Metadata:
  
        encoder         : Lavc57.95.101 libx264
  
      Side data:
  
        cpb: bitrate max/min/avg: 2000000/0/1300000 buffer size: 2048000 vbv_delay: -1
  
      Stream #0:1: Audio: aac (libfdk_aac), 44100 Hz, stereo, s16, 128 kb/s
  
      Metadata:
  
        encoder         : Lavc57.95.101 libfdk_aac
  
  frame=   61 fps= 30 q=25.0 size=N/A time=00:00:01.97 bitrate=N/A speed=0.961x        
  
  WriteN, RTMP send error 104 (136 bytes)