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• flush encoded packets to disk when muxing audio and video

  23 juin 2016, par chandu

  I am using muxing.c example (without any modifications) provided with ffmpeg 3.0 version to create MP4 file (H.264 & AAC) with VS 2013. The sample is working fine with default width & height for video. But when changed the width to 1920 and height to 1080, sample is taking nearly 400MB (using task manager & in Release mode) through out the program and also never writing the encoded packets to the out file. It is writing to the out file (out.mp4) only when calling avcodec_close() at the end.

  I have tried to

  1. free the encoded packet after calling write_frame().
  2. used avio_flush()
  3. used avcodec_flush_buffers()

  but no success.

  Could anybody please tell me, how can I save the every encoded packet to disk by not keeping in RAM, so the memory usage would be low ?

  Note : There is no issue with flushing the buffers after recording is over, I am doing this by calling av_interleaved_write_frame() with AVPacket NULL.

• Webcam streaming from Mac using FFmpeg

  22 juillet 2016, par Galaxy

  I want to stream my webcam from Mac using FFmpeg.

  First I checked the supported devices using ffmpeg -f avfoundation -list_devices true -i ""

  Output :

  [AVFoundation input device @ 0x7fdf1bd03000] AVFoundation video devices:
  
  [AVFoundation input device @ 0x7fdf1bd03000] [0] USB 2.0 Camera #2
  
  [AVFoundation input device @ 0x7fdf1bd03000] [1] FaceTime HD Camera
  
  [AVFoundation input device @ 0x7fdf1bd03000] [2] Capture screen 0
  
  [AVFoundation input device @ 0x7fdf1bd03000] [3] Capture screen 1
  
  [AVFoundation input device @ 0x7fdf1bd03000] AVFoundation audio devices:
  
  [AVFoundation input device @ 0x7fdf1bd03000] [0] Built-in Microphone

  The device[0] is the webcam I want to use.

  ---

  Then I tried to capture the webcam using ffmpeg -f avfoundation -i "0" out.mpg

  Output :

  [avfoundation @ 0x7fe7f3810600] Selected framerate (29.970030) is not supported by the device
  
  [avfoundation @ 0x7fe7f3810600] Supported modes:
  
  [avfoundation @ 0x7fe7f3810600]   320x240@[120.101366 120.101366]fps
  
  [avfoundation @ 0x7fe7f3810600]   640x480@[120.101366 120.101366]fps
  
  [avfoundation @ 0x7fe7f3810600]   800x600@[60.000240 60.000240]fps
  
  [avfoundation @ 0x7fe7f3810600]   1024x768@[30.000030 30.000030]fps
  
  [avfoundation @ 0x7fe7f3810600]   1280x720@[60.000240 60.000240]fps
  
  [avfoundation @ 0x7fe7f3810600]   1280x1024@[30.000030 30.000030]fps
  
  [avfoundation @ 0x7fe7f3810600]   1920x1080@[30.000030 30.000030]fps
  
  [avfoundation @ 0x7fe7f3810600]   320x240@[30.000030 30.000030]fps
  
  [avfoundation @ 0x7fe7f3810600]   640x480@[30.000030 30.000030]fps
  
  [avfoundation @ 0x7fe7f3810600]   800x600@[20.000000 20.000000]fps
  
  [avfoundation @ 0x7fe7f3810600]   1024x768@[6.000002 6.000002]fps
  
  0: Input/output error

  ---

  After that, I tried stream this webcam from my Mac using ffmpeg -f avfoundation -framerate 30 -i "0" -f mpeg1video -b 200k -r 30 -vf scale=1920:1080 http://127.0.0.1:8082/

  Output :

  [avfoundation @ 0x7f8515012800] An error occurred: The activeVideoMinFrameDuration passed is not supported by the device.  Use -activeFormat.videoSupportedFrameRateRanges to discover valid ranges.0: Input/output error

  ---

  I cannot capture or stream this webcam. However when I used the Facetime camera instead of this webcam, everything was OK. I’ve been searching for this problem for a few days, but still cannot fix it. Does anyone have experience with webcam and FFmpeg on Mac ?

• JavaCV FFmpegFrameRecorder Video output reddish color

  14 juin 2016, par Diego Perozo

  I am trying to make a video .mp4 file out of a group of images using FFmpegFrameRecorder as a part of a bigger program, so I set up a test project in which I try to make a video out of 100 instances of the same frame at 25fps. The program seems to work. However, every time I run it the image seems to be reddish. As if a red filter had been applied to it.

  Here’s the code snippet :

  public static void main(String[] args) {
  
      File file = new File("C:/Users/Diego/Desktop/tc-images/image0.jpg");
  
      BufferedImage img = null;
  
      try {
  
          img = ImageIO.read(file);
  
      } catch (IOException e1) {
  
          e1.printStackTrace();
  
      }
  
      IplImage image = IplImage.createFrom(img); 
  
      FFmpegFrameRecorder recorder = new FFmpegFrameRecorder("C:/Users/Diego/Desktop/tc-images/test.mp4",1920,1080); 
  
      try { 
  
      recorder.setVideoCodec(13);
  
      recorder.setFormat("mp4");
  
      recorder.setPixelFormat(0);
  
      recorder.setFrameRate(25);
  
      recorder.start(); 
  
      for (int i=0;i<100;i++){ 
  
      recorder.record(image); 
  
      } 
  
      recorder.stop(); 
  
      } 
  
      catch (Exception e){ 
  
      e.printStackTrace(); 
  
      } 
  
  }

  I’d appreciate it if anybody told me what’s wrong. Thanks in advance for any help.