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• Ffmpeg : copy chapter and remove tags mkv files

  15 décembre 2018, par Chris

  I’m working with MKV files only. When I convert from original to target, video and audio works 100%. I however have issues copying the Chapters too, sometimes it works, other times not. The output file also contains 3 Tags I need to get rid of :

  Using MKVToolsNiX to check Output file :

  1. Entry - Global Tags
  2. Entries - Tags
  3. Entries - Tags

  My commandline looks like this :

  -map_metadata -1 -map 0:0 -map 0:1 -metadata:s:a:0 language=eng -metadata:s:v:0 language=eng -metadata:s:s:0 language=eng -c:v libx264 -s 1280x720 -pix_fmt yuv420p -b:v 2500k -r 30 -c:a ac3 -b:a 320k -ar 48000 -ac 6 -y

  Any help will be appreciated.

  Chris

• Record RTSP audio stream G.726 without transcoding

  24 décembre 2018, par Artem Suprunov

  I receive live stream from ip camera (via rtsp) with video H264 and audio G.726. I need to store the stream in file (mp4 preferably) without transcoding. Video is recorded, but seems that ffmpeg cannot write G.726 nor to mp4 neither to other containers I’ve tried, like avi, mkv, ogg and so on.

  ffmpeg -i rtsp :... -vcodec copy -acodec copy test.mp4

  Here is audio stream info :

  Stream #0:1 : Audio : adpcm_g726le, 8000 Hz, mono, s16, 16 kb/s

  Error :

  Could not find tag for codec adpcm_g726le in stream #0, codec not
  currently supported in container

  Also I tried live555 and GStreamer, but no success with audio stream.

  Is there any possibility to record G.726 with no transcoding ? If there is any C/C++ lib that can do this, point me please to it.

  Update. Solution with Gstreamer for mkv :

  gst-launch-1.0 -e rtspsrc location=rtsp :... name=rtspsrc ! rtph264depay ! h264parse ! matroskamux name=mux ! filesink location="test.mkv" rtspsrc. ! rtpg726depay ! mux.

• How can I record the desktop action to a video file with ffmpeg without showing the ffmpeg console window ?

  24 décembre 2018, par Dubi Duboni

  Tried this method either by calling it from the constructor or a button click event :

  private void StartRecordingDesktop()
  
          {
  
              Process process = new Process();
  
  
  
              // Stop the process from opening a new window
  
              process.StartInfo.RedirectStandardOutput = true;
  
              process.StartInfo.UseShellExecute = false;
  
              process.StartInfo.CreateNoWindow = true;
  
              process.StartInfo.WindowStyle = ProcessWindowStyle.Hidden;
  
  
  
              // Setup executable and parameters
  
              process.StartInfo.FileName = @"d:\SavedScreenshots\ffmpeg.exe";
  
              process.StartInfo.Arguments = "-f gdigrab -framerate 24 -i desktop -preset ultrafast -pix_fmt yuv420p testwithforms.mp4";
  
  
  
              // Go
  
              process.Start();
  
          }

  Two problems :

  1. It’s not recording when I shut down the application there is no video file on the hard disk.

  2. When I shut down the application sometimes it leaves a working exe file parto f the ffmpeg in the background that make the mouse cursor to shake a bit stuttering.

  What I want is to start/stop recording without showing the ffmpeg console window. The idea in the end is to make some identification of the recording mode if recording or not using a tray icon as indiacator.