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• Capture video using FFmpeg in Android

  3 juillet 2015, par Robert Miller

  I’ve made a simple camera app just to learn how to capture video on an Android device. The clip is currently recorded with the help of the MediaRecorder library. A preview is shown in a VideoView before recording starts, and continues to show this during the actual recording.
  As I have understood, recording of videos can also be done by creating an Intent and calling an external Activity, which would result in the previous activity to be paused and destroyed (correct ?).

  Anyways, for this project I prefer the first approach, to not leave the activity. But unfortunately, I experience issues with the MediaRecorder library due to a known bug (which by the way seems to have been around for years). So now I have come across FFmpeg and this "TouchToRecord" (link below) demo project that uses FFmpeg Recorder from JavaCV to capture videos by touching the screen. Awesome ! Except that I do not want to start the camera as a new activity, as they do in this example. I want to remain in the same activity and see the preview and record in a VideoView directly. To touch the VideoView to record isn’t necessary.
  Do you think it’s possible to use the same library (JavaCvVideoRecorder), as the creator of this demo project have been using, to do this ? Or is there a better way which I have not yet discovered ?

  In the end, all I want to do is being able to record video directly into a VideoView, without using the MediaRecorder library.

  Link to demo project : https://github.com/sourab-sharma/TouchToRecord

• using ffprobe to create numeric output

  8 juin 2015, par edwardsmarkf

  easy newbie question - i hope this is an appropriate forum

  i have been using this npm module : npmjs(dot)com/package/waveform-util

  and this npm module creates waveform numeric output such as this below :

  [0,0.0062,0.0688,0.2524,0.2691,0.2645,0.1594,0.1397,0.1672

  however, this module does not seem reliable and has not been maintained for a couple of years now. the module describes itself as a "tiny wrapper around ffprobe".

  my question - what would the command line look like to produce such output ?

  thank you all in advance.

  UPDATE :

  i have carefully looked at :

  ffprobe   -show_packets  -show_data  -show_streams  -i  file.opus ;

  but i am not seeing any value here that reflects the audio volume level, or i am seeing but not recognizing it.

• JavaCV Stream-Test code giving Error

  23 juin 2015, par user1507600

  I’m hoping someone might be able to tell me what I’m doing wrong here. I downloaded vanevery’s GitHub project “JavaCV-0.5-Stream-Test" which is a couple of years old so I updated to the latest JavaCV version 0.11. But Android Studio is returning the error...

  Error :

  "record(org.bytedeco.javacpp.Frame) in FFmpegFrameRecorder cannot be
  applied to (org.bytedeco.javacpp.opencv_core.lplimage)" for the line
  of code which reads recorder.record(yuvIplimage), under
  onPreviewFrame.

  Here is my code :

      @Override
  
      public void onPreviewFrame(byte[] data, Camera camera) {
  
  
  
          if (yuvIplimage != null && recording) {
  
  
  
              videoTimestamp = 1000 * (System.currentTimeMillis() - startTime);
  
  
  
              // Put the camera preview frame right into the yuvIplimage object
  
              yuvIplimage.getByteBuffer().put(data);
  
  
  
              try {
  
                  // Get the correct time
  
                  recorder.setTimestamp(videoTimestamp);
  
  
  
                  // Record the image into FFmpegFrameRecorder
  
                  recorder.record(yuvIplimage);
  
  
  
              } catch (FFmpegFrameRecorder.Exception e) {
  
                  Log.v(LOG_TAG,e.getMessage());
  
                  e.printStackTrace();
  
              }
  
          }
  
      }