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• When I use ffmpeg to record video, why does recording pause and hang

  24 décembre 2019, par Polarstars

  I am using FFmpeg to record RTP stream, but encounter a problem :

  I use follow command :

  FFmpeg -thread_queue_size 128 -i http://0.0.0.0:8012/rtp/239.3.1.141:1234 -map 0 -c copy -t 36000 /home/iptv/test.ts

  When the video frame number reaches 142275, the following prompt appears :

  1.New video stream 0:2 at pos:5699333740 and DTS:36464.9s

  2.New audio stream 0:3 at pos:5699385628 and DTS:36464.1s

  And then the recording process is suspended.

  According to the prompt, it seems that the location of the video stream has changed.

  I would appreciate it if anyone could help me with this problem

  ---

  Input #0, mpegts, from ’http://0.0.0.0:8012/rtp/239.3.1.141:1234’ :

  Duration : N/A, start : 25297.448000, bitrate : N/A

  Program 1 
  
  
  
  Metadata:
  
  
  
    service_name    : 
  
  
  
    service_provider: 
  
  
  
  Stream #0:0[0x1011]: Video: h264 (High) ([27][0][0][0] / 0x001B), yuv420p(tv, top first), 1920x1080 [SAR 1:1 DAR 16:9], 25 fps, 25 tbr, 90k tbn, 50 tbc
  
  
  
  Stream #0:1[0x1100]: Audio: mp2 ([3][0][0][0] / 0x0003), 48000 Hz, stereo, fltp, 128 kb/s

  Output #0, mpegts, to ’/home/TJTV/TJTV_20191224-073001.ts’ :

  Metadata :

  encoder         : Lavf58.35.101
  
  
  
  Stream #0:0: Video: h264 (High) ([27][0][0][0] / 0x001B), yuv420p(tv, top first), 1920x1080 [SAR 1:1 DAR 16:9], q=2-31, 25 fps, 25 tbr, 90k tbn, 90k tbc
  
  
  
  Stream #0:1: Audio: mp2 ([3][0][0][0] / 0x0003), 48000 Hz, stereo, fltp, 128 kb/s

  Stream mapping :

  Stream #0:0 -> #0:0 (copy)

  Stream #0:1 -> #0:1 (copy)

  Press [q] to stop, [?] for help

  frame= 109 fps=107 q=-1.0 size= 4096kB time=00:00:05.32 bitrate=6297.8kbits/s speed=5.22x

  frame= 133 fps= 65 q=-1.0 size= 4864kB time=00:00:06.33 bitrate=6288.8kbits/s speed=3.08x

  frame= 154 fps= 50 q=-1.0 size= 5888kB time=00:00:07.17 bitrate=6721.6kbits/s speed=2.32x

  frame= 179 fps= 43 q=-1.0 size= 6912kB time=00:00:08.18 bitrate=6918.8kbits/s speed=1.98x

  ---

  ...

  frame=142250 fps= 25 q=-1.0 size= 5452032kB time=01:34:50.95 bitrate=7848.1kbits/s speed= 1x

  frame=142275 fps= 25 q=-1.0 size= 5453056kB time=01:34:51.96 bitrate=7848.2kbits/s speed= 1x

  [NULL @ 0x5faf000] SPS unavailable in decode_picture_timing

  [NULL @ 0x5faf000] non-existing PPS 0 referenced

  [mpegts @ 0x5faab40] New video stream 0:2 at pos:5699333740 and DTS:36464.9s

  [NULL @ 0x5faf000] SPS unavailable in decode_picture_timing

  [NULL @ 0x5faf000] non-existing PPS 0 referenced

  frame=142299 fps= 25 q=-1.0 size= 5454080kB time=01:34:52.94 bitrate=7848.3kbits/s speed= 1x

  [NULL @ 0x5faf000] SPS unavailable in decode_picture_timing

  [NULL @ 0x5faf000] SPS unavailable in decode_picture_timing

  [NULL @ 0x5faf000] non-existing PPS 0 referenced

  [mpegts @ 0x5faab40] New audio stream 0:3 at pos:5699385628 and DTS:36464.1s

  [NULL @ 0x5faf000] SPS unavailable in decode_picture_timing

  [NULL @ 0x5faf000] non-existing PPS 0 referenced

  frame=142299 fps= 25 q=-1.0 size= 5454080kB time=01:34:52.94 bitrate=7848.3kbits/s speed= 1x

  frame=142299 fps= 25 q=-1.0 size= 5454080kB time=01:34:52.94 bitrate=7848.3kbits/s speed= 1x

  frame=142299 fps= 25 q=-1.0 size= 5454080kB time=01:34:52.94 bitrate=7848.3kbits/s speed= 1x

  frame=142299 fps= 25 q=-1.0 size= 5454080kB time=01:34:52.94 bitrate=7848.3kbits/s speed= 1x

• Flutter record front facing camera at exact same time as playing video

  27 novembre 2020, par xceed

  I've been playing around with Flutter and trying to get it so I can record the front facing camera (using the camera plugin [https://pub.dev/packages/camera]) as well as playing a video to the user (using the video_player plugin [https://pub.dev/packages/video_player]).

  


  Next I use ffmpeg to horizontally stack the videos together. This all works fine but when I play back the final output there is a slight delay when listening to the audio. I'm calling Future.wait([cameraController.startVideoRecording(filePath), videoController.play()]); but there is a slight delay in these tasks actually starting. I don't even need them to fire at the exact same time (which I'm realising is probably impossible), instead if I knew exactly when each of the tasks begun then I can use the time difference to sync the audio using ffmpeg or similar.

  


  I've tried adding a listener on the videoController to see when isPlaying first returns true, and also watching the output directory for when the recorded video appears on the filesystem :

  


        listener = () {
        if (videoController.value.isPlaying) {
          isPlaying = DateTime.now().microsecondsSinceEpoch;
          log('isPlaying '+isPlaying.toString());
        }
        videoController.removeListener(listener);
      };
      videoController.addListener(listener);

      var watcher = DirectoryWatcher('${extDir.path}/');
      watcher.events.listen((event) {
        if (event.type == ChangeType.ADD) {
          fileAdded = DateTime.now().microsecondsSinceEpoch;
          log('added '+fileAdded.toString());
        }
      });


  


  Then likewise for checking if the camera is recording :

  


      var listener;
    listener = () {
      if (cameraController.value.isRecordingVideo) {
        log('isRecordingVideo '+DateTime.now().microsecondsSinceEpoch.toString());
        //cameraController.removeListener(listener);
      }
    };
    cameraController.addListener(listener);


  


  This results in (for example) the following order and microseconds for each event :

  


  is playing: 1606478994797247
is recording: 1606478995492889 (695642 microseconds later)
added: 1606478995839676 (346787 microseconds later)


  


  However, when I play back the video the syncing is off by approx 0.152 seconds so doesn't marry up to the time differences reported above.

  


  Does anyone have any idea how I could accomplish near perfect syncing when combining 2 videos ? Thanks.

  


• How to record video and audio from webcam using ffmpeg ?

  10 mars 2017, par Ashish

  I want to record video as well as audio from webcam using ffmpeg,

  I have used the following codes to know what devices are available :

  ffmpeg -list_devices true -f dshow -i dummy

  And got the result :

  ffmpeg version N-54082-g96b33dd Copyright (c) 2000-2013 the FFmpeg developers
  
  built on Jun 17 2013 02:05:16 with gcc 4.7.3 (GCC)
  
  configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-av
  
  isynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enab
  
  le-iconv --enable-libass --enable-libbluray --enable-libcaca --enable-libfreetyp
  
  e --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --ena
  
  ble-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-l
  
  ibopus --enable-librtmp --enable-libschroedinger --enable-libsoxr --enable-libsp
  
  eex --enable-libtheora --enable-libtwolame --enable-libvo-aacenc --enable-libvo-
  
  amrwbenc --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxavs --
  
  enable-libxvid --enable-zlib
  
  libavutil      52. 37.101 / 52. 37.101
  
  libavcodec     55. 16.100 / 55. 16.100
  
  libavformat    55.  8.103 / 55.  8.103
  
  libavdevice    55.  2.100 / 55.  2.100
  
  libavfilter     3. 77.101 /  3. 77.101
  
  libswscale      2.  3.100 /  2.  3.100
  
  libswresample   0. 17.102 /  0. 17.102
  
  libpostproc    52.  3.100 / 52.  3.100
  
  [dshow @ 024eb460] DirectShow video devices
  
  [dshow @ 024eb460]  "Sirius USB2.0 Camera"
  
  [dshow @ 024eb460]  "Vimicro USB Camera (Altair)"
  
  [dshow @ 024eb460] DirectShow audio devices
  
  [dshow @ 024eb460]  "Microphone (Realtek High Defini"
  
  dummy: Immediate exit requested

  I am using the following codes to get more details about the device :

  ffmpeg -f dshow -list_options true -i video="Vimicro USB Camera (Altair)"

  And i am getting the following results :

  ffmpeg version N-54082-g96b33dd Copyright (c) 2000-2013 the FFmpeg developers
  
  built on Jun 17 2013 02:05:16 with gcc 4.7.3 (GCC)
  
  configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-av
  
  isynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enab
  
  le-iconv --enable-libass --enable-libbluray --enable-libcaca --enable-libfreetyp
  
  e --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --ena
  
  ble-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-l
  
  ibopus --enable-librtmp --enable-libschroedinger --enable-libsoxr --enable-libsp
  
  eex --enable-libtheora --enable-libtwolame --enable-libvo-aacenc --enable-libvo-
  
  amrwbenc --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxavs --
  
  enable-libxvid --enable-zlib
  
  libavutil      52. 37.101 / 52. 37.101
  
  libavcodec     55. 16.100 / 55. 16.100
  
  libavformat    55.  8.103 / 55.  8.103
  
  libavdevice    55.  2.100 / 55.  2.100
  
  libavfilter     3. 77.101 /  3. 77.101
  
  libswscale      2.  3.100 /  2.  3.100
  
  libswresample   0. 17.102 /  0. 17.102
  
  libpostproc    52.  3.100 / 52.  3.100
  
  [dshow @ 0249b3e0] DirectShow video device options
  
  [dshow @ 0249b3e0]  Pin "Capture"
  
  [dshow @ 0249b3e0]   pixel_format=yuyv422  min s=640x480 fps=30 max   s=640x480 fp
  
  s=30
  
  [dshow @ 0249b3e0]   pixel_format=yuyv422  min s=640x480 fps=30 max s=640x480 fp
  
  s=30
  
  [dshow @ 0249b3e0]   pixel_format=yuyv422  min s=352x288 fps=30 max s=352x288 fp
  
  s=30
  
  [dshow @ 0249b3e0]   pixel_format=yuyv422  min s=352x288 fps=30 max s=352x288 fp
  
  s=30
  
  [dshow @ 0249b3e0]   pixel_format=yuyv422  min s=320x240 fps=30 max s=320x240 fp
  
  s=30
  
  [dshow @ 0249b3e0]   pixel_format=yuyv422  min s=320x240 fps=30 max s=320x240 fp
  
  s=30
  
  [dshow @ 0249b3e0]   pixel_format=yuyv422  min s=176x144 fps=30 max s=176x144 fp
  
  s=30
  
  [dshow @ 0249b3e0]   pixel_format=yuyv422  min s=176x144 fps=30 max s=176x144 fp
  
  s=30
  
  [dshow @ 0249b3e0]   pixel_format=yuyv422  min s=160x120 fps=30 max s=160x120 fp
  
  s=30
  
  [dshow @ 0249b3e0]   pixel_format=yuyv422  min s=160x120 fps=30 max s=160x120 fp
  
  s=30
  
  video=Vimicro USB Camera (Altair): Immediate exit requested

  When i am trying following codes to get video and audio stream :

  ffmpeg -f dshow -s 320x240 -r 30 -vcodec mjpeg -i video="Vimicro USB Camera (Altair)" e:\output.mp4

  I am getting an error message as "Could not set video options
  video=Vimicro USB Camera (Altair) : Input/output error"

  Following are the error details :

  ffmpeg version N-54082-g96b33dd Copyright (c) 2000-2013 the FFmpeg developers
  
  built on Jun 17 2013 02:05:16 with gcc 4.7.3 (GCC)
  
  configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-av
  
  isynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enab
  
  le-iconv --enable-libass --enable-libbluray --enable-libcaca --enable-libfreetyp
  
  e --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --ena
  
  ble-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-l
  
  ibopus --enable-librtmp --enable-libschroedinger --enable-libsoxr --enable-libsp
  
  eex --enable-libtheora --enable-libtwolame --enable-libvo-aacenc --enable-libvo-
  
  amrwbenc --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxavs --
  
  enable-libxvid --enable-zlib
  
  libavutil      52. 37.101 / 52. 37.101
  
  libavcodec     55. 16.100 / 55. 16.100
  
  libavformat    55.  8.103 / 55.  8.103
  
  libavdevice    55.  2.100 / 55.  2.100
  
  libavfilter     3. 77.101 /  3. 77.101
  
  libswscale      2.  3.100 /  2.  3.100
  
  libswresample   0. 17.102 /  0. 17.102
  
  libpostproc    52.  3.100 / 52.  3.100
  
  [dshow @ 002f78e0] Could not set video options
  
  video=Vimicro USB Camera (Altair): Input/output error

  And i am unable to find where i am doing wrong.

  So if anybody can find where i am doing wrong or how to record video as well as audio from webcam using ffmpeg please help me to solve this problem.