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• ffmpeg real-time buffer too full or near too full frame dropped, I even tried increasing rtbufsize. What could be going wrong ?

  21 mai 2024, par Ali Azlan

  We have a software where we capture the stream from the camera connected to the laptop or device using ffmpeg python,

  


                   ffmpeg
                .input(video, s='640x480', **self.args) //tried with rtbufsize=1000M (enough I suupose/ also sometimes the error does not occur even on default rtbufsize which is around 3MB)
                .output('pipe:', format='rawvideo', pix_fmt='rgb24')
                .overwrite_output()
                .run_async(pipe_stdout=True) 


  


  majority of the times when I start the software like the software is still initiating we receive the following error, I have also received this error when the software has initiated fully and completely and it is running from a long time like after 12hrs or more.

  


  


  Error : [dshow @ 000002248916e240] real-time buffer [Integrated
Camera] [video input] too full or near too full (80% of size : 3041280
[rtbufsize parameter]) ! frame dropped !
Last message repeated 1 times [dshow @ 000002248916e240] real-time buffer [Integrated Camera] [video input] too full or near too full
(101% of size : 3041280 [rtbufsize parameter]) ! frame dropped !

  


  


  What are the things we possibly might be doing wrong ?

  


  Edit 1 :

  


  below is the code to consume the frame captured in the video using ffmpeg

  


      def frame_reader(self):
    while True:
        in_bytes = self.process.stdout.read(self.width * self.height * 3)
        if not in_bytes:
            break
        try:
            in_frame = (
                np
                    .frombuffer(in_bytes, np.uint8)
                    .reshape([self.height, self.width, 3])
            )
            frame = cv2.resize(in_frame, (640, 480))
            frame = cv2.cvtColor(frame, cv2.COLOR_RGB2BGR)
        except Exception as e:
            logger.error(e, exc_info=True)
            in_frame = (
                np
                    .frombuffer(in_bytes, np.uint8)
            )

        if not self.q.empty():
            try:
                self.q.get_nowait()
            except queue.Empty:
                pass
        self.q.put(frame)


  


• How to reduce file size of a video without loosing quality using an ffmpeg command ? [closed]

  11 mars 2024, par Shadab Mehdi

  I have received a video that is Full HD 1920 x 1080 and is nearly 62 GB. I know something is off here. I have seen similar videos under 3-4 GB.

  


  I tried to reduce the size by running the following command

  


  ffmpeg -i MyVideo.mpg -vcodec libx265 -crf 28 Compressed.mp4


  


  But it produced horrible out-of-sync audio. The video quality was OK.

  


  Here is a dump of ffprobe video output for better understanding.

  


  ffprobe -v quiet -print_format json -show_format -show_streams -print_format json MyVideo.mpg


  


  The output of the above command produces this response

  


  {
  "streams": [
    {
      "index": 0,
      "codec_name": "mpeg2video",
      "codec_long_name": "MPEG-2 video",
      "profile": "Main",
      "codec_type": "video",
      "codec_tag_string": "[0][0][0][0]",
      "codec_tag": "0x0000",
      "width": 1920,
      "height": 1080,
      "coded_width": 0,
      "coded_height": 0,
      "closed_captions": 0,
      "film_grain": 0,
      "has_b_frames": 1,
      "sample_aspect_ratio": "1:1",
      "display_aspect_ratio": "16:9",
      "pix_fmt": "yuv420p",
      "level": 4,
      "color_range": "tv",
      "chroma_location": "left",
      "field_order": "progressive",
      "refs": 1,
      "id": "0x1e0",
      "r_frame_rate": "25/1",
      "avg_frame_rate": "25/1",
      "time_base": "1/90000",
      "start_pts": 22503,
      "start_time": "0.250033",
      "duration_ts": 643863600,
      "duration": "7154.040000",
      "extradata_size": 150,
      "disposition": {
        "default": 0,
        "dub": 0,
        "original": 0,
        "comment": 0,
        "lyrics": 0,
        "karaoke": 0,
        "forced": 0,
        "hearing_impaired": 0,
        "visual_impaired": 0,
        "clean_effects": 0,
        "attached_pic": 0,
        "timed_thumbnails": 0,
        "non_diegetic": 0,
        "captions": 0,
        "descriptions": 0,
        "metadata": 0,
        "dependent": 0,
        "still_image": 0
      },
      "side_data_list": [
        {
          "side_data_type": "CPB properties",
          "max_bitrate": 80000000,
          "min_bitrate": 0,
          "avg_bitrate": 0,
          "buffer_size": 9781248,
          "vbv_delay": -1
        }
      ]
    },
    {
      "index": 1,
      "codec_name": "mp2",
      "codec_long_name": "MP2 (MPEG audio layer 2)",
      "codec_type": "audio",
      "codec_tag_string": "[0][0][0][0]",
      "codec_tag": "0x0000",
      "sample_fmt": "s16p",
      "sample_rate": "48000",
      "channels": 2,
      "channel_layout": "stereo",
      "bits_per_sample": 0,
      "initial_padding": 0,
      "id": "0x1c0",
      "r_frame_rate": "0/0",
      "avg_frame_rate": "0/0",
      "time_base": "1/90000",
      "start_pts": 15303,
      "start_time": "0.170033",
      "duration_ts": 643870080,
      "duration": "7154.112000",
      "bit_rate": "384000",
      "disposition": {
        "default": 0,
        "dub": 0,
        "original": 0,
        "comment": 0,
        "lyrics": 0,
        "karaoke": 0,
        "forced": 0,
        "hearing_impaired": 0,
        "visual_impaired": 0,
        "clean_effects": 0,
        "attached_pic": 0,
        "timed_thumbnails": 0,
        "non_diegetic": 0,
        "captions": 0,
        "descriptions": 0,
        "metadata": 0,
        "dependent": 0,
        "still_image": 0
      }
    }
  ],
  "format": {
    "filename": "MyVideo.mpg",
    "nb_streams": 2,
    "nb_programs": 0,
    "format_name": "mpeg",
    "format_long_name": "MPEG-PS (MPEG-2 Program Stream)",
    "start_time": "0.170033",
    "duration": "7154.120000",
    "size": "62752258052",
    "bit_rate": "70171881",
    "probe_score": 26
  }
}


  


• fftools/ffprobe : stop using AVFrame.pkt_{pos,size}

  9 mars 2023, par Anton Khirnov

  fftools/ffprobe : stop using AVFrame.pkt_pos,size
  These fields are ad-hoc and will be deprecated. Use the recently-added
  
  AV_CODEC_FLAG_COPY_OPAQUE to pass arbitrary user data from packets to
  
  frames.
  Changes the result of the flcl1905 test, which uses ffprobe to decode
  
  wmav2 with multiple frames per packet. Such packets are handled
  
  internally by calling the decoder's decode callback multiple times,
  
  offsetting the internal packet's data pointer and decreasing its size
  
  after each call. The output pkt_size value before this commit is then
  
  the remaining internal packet size at the time of each internal decode
  
  call.
  After this commit, output pkt_size is simply the size of the full packet
  
  submitted by the caller to the decoder. This is more correct, since
  
  internal packets are never seen by the caller and should have no
  
  observable outside effects.
  

  • [DH] fftools/ffprobe.c
  • [DH] tests/ref/fate/flcl1905