How to use avcodec_receive_frame?

[ghost]

I have a simple app with this decoding method:

      ```
      static int decode(AVCodecContext *avctx, AVFrame *frame, int *got_frame, AVPacket *pkt)
      {
      int ret;
      *got_frame = 0;
      if (pkt) 
      {
                ret = avcodec_send_packet(avctx, pkt);
                if (ret < 0) 
                {
                          return ret == AVERROR_EOF ? 0 : ret;
                }
      }
      ret = avcodec_receive_frame(avctx, frame);
      if (ret < 0 && ret != AVERROR(EAGAIN) && ret != AVERROR_EOF) 
      {
                return ret;
      }
      if (ret >= 0)
      {
                *got_frame = 1;
      }
      return 0;
      }

I use this method to store video clip but there are a few frames in the video clip with errors or 'miss frames' from previous clip.

avcodec_receive_frame(avctx, frame); - returns code '-11' that stands for 'other negative values: legitimate decoding errors'. What the 'other negative values' are?

[h4tr3d]

Sorry for delay. Just reference to official docs:

• https://ffmpeg.org/doxygen/trunk/group__lavc__decoding.html#ga11e6542c4e66d3028668788a1a74217c
• https://ffmpeg.org/doxygen/trunk/group__lavc__decoding.html#ga58bc4bf1e0ac59e27362597e467efff3

and new send/receive API overview:

• https://ffmpeg.org/doxygen/3.3/group__lavc__encdec.html

In short: all (or most) codecs has "delay": count of frames/packet that should be pushed to the codec before first packet/frame received. Obviously, codec context has some queue. So, when pipeline restarts, you must flush this queue by sending some special data.