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• avcodec/bintext : Add error message when resolution is too small for font.

  9 avril 2019, par Nikolas Bowe

  avcodec/bintext : Add error message when resolution is too small for font.
  Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
  

  • [DH] libavcodec/bintext.c

• Is it possible to change fps and resolution of a stream to ffserver ?

  1er mai 2019, par sanketsans97

  I am trying to stream to ffserver. But my aim is to tweak with the fps and resolution of the stream on the fly without restarting the whole ffserver session.

  I tried changing the resolution, but it completely restarts the whole session and there is a minor glitch or a pause you can notice when the whole session starts !

  I am hoping to make the changes without making the session restart !

• Increase resolution of captured image using avconv

  26 novembre 2014, par user3723711

  I am trying to increase resolution of a frame.

  First I am setting two virtual devices using gst-launch-0.10 :

  gst-launch-0.10 v4l2src device=/dev/video1 ! video/x-raw-rgb,framerate=30/1,width=640,height=480 ! ffmpegcolorspace ! tee name=t ! v4l2sink device=/dev/video2 t. ! queue ! v4l2sink device=/dev/video3

  then for /dev/video2 I am using ffmpeg to stream video and then I send this stream to browser :

  ffmpeg -s 640x480 -f video4linux2 -i /dev/video2 -f mpeg1video -b 800k -r 30 http://localhost:8082/pass/640/480/

  now on my browser when user clicks on "capture" button I am using this function to capture the frame from ffmpeg stream using avconv :

  function captureImage(res, path) {
  
      var ffmpeg_options = ['-s', '1280x720', '-f', 'video4linux2', '-i', '/dev/video3', '-ss', '0:0:0', '-frames', '1', path];
  
      avcov_capture = spawn('avconv', ffmpeg_options, null);
  
      var stream = false;
  
      avcov_capture.stdout.on('data', function(buf) {
  
          console.log('CAP OUT: ' + buf.toString());
  
      });
  
      avcov_capture.stderr.on('data', function(data) {
  
          if (data.toString().indexOf('frame') >= 0) {
  
              var ret = {
  
                  result : 'captured',
  
                  path : path
  
              };
  
              checkFile(res, ret, path);
  
          }
  
      });
  
  };

  My question is when I capture a frame using avconv (in captureImage function), how I can increase the resolution of that image and stop ffmpeg stream after I capture a frame ?

  Is it a better idea if I increase resolution of video stream sent to video2 in gst-launch pipeline ?If so how can I add that setting to my pipeline.