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Sur d’autres sites (11681)

  • Revision 872c6d85c0 : Merge "speed up inc_mv_component"

    4 septembre 2013, par Jim Bankoski

    Merge "speed up inc_mv_component"

  • Revision b6dbf11ed5 : Merge "Adds a speed feature for fast 1-loop forw updates"

    30 août 2013, par Deb Mukherjee

    Changed Paths :
     Modify /vp9/encoder/vp9_bitstream.c


     Modify /vp9/encoder/vp9_onyx_if.c


     Modify /vp9/encoder/vp9_onyx_int.h



    Merge "Adds a speed feature for fast 1-loop forw updates"

  • Android MediaRecorder setCaptureRate() and video playback speed

    7 novembre 2013, par spitzanator

    I've got a MediaRecorder recording video, and I'm very confused by the effect of setCaptureRate().

    Specifically, I prepare my MediaRecorder as follows :

    mMediaRecorder = new MediaRecorder();
    
mCamera.stopPreview();
    
mCamera.unlock();
    
mMediaRecorder.setCamera(mCamera);
    
mMediaRecorder.setVideoSource(MediaRecorder.VideoSource.CAMERA);
    
mMediaRecorder.setProfile(CamcorderProfile.QUALITY_TIME_LAPSE_480P);
    
mMediaRecorder.setCaptureRate(30f);
    
mMediaRecorder.setOrientationHint(270);
    
mMediaRecorder.setOutputFile(...);
    
mMediaRecorder.setPreviewDisplay(...);
    
mMediaRecorder.prepare();

    I record for five seconds (with a CountDownTimer, but that's irrelevant), and this is the file that gets generated :

    $ ffmpeg -i ~/CaptureRate30fps.mp4 
    
...
    
Seems stream 0 codec frame rate differs from container frame rate: 180000.00 (180000/1) -> 30.00 (30/1)
    
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/home/mspitz/CaptureRate30fps.mp4':
    
  Metadata:
    
    major_brand     : isom
    
    minor_version   : 0
    
    compatible_brands: isom3gp4
    
    creation_time   : 2013-06-04 00:52:00
    
  Duration: 00:00:02.59, start: 0.000000, bitrate: 5238 kb/s
    
    Stream #0.0(eng): Video: h264 (Baseline), yuv420p, 720x480, 5235 kb/s, PAR 65536:65536 DAR 3:2, 30 fps, 30 tbr, 90k tbn, 180k tbc
    
    Metadata:
    
      creation_time   : 2013-06-04 00:52:00

    Note that the Duration is just about 3 seconds. The video also plays much faster, as if it were 5 seconds of video crammed into 3.

    Now, if I record by preparing my mediaRecorder exactly as above, but subtracting the setCaptureRate(30f) line, I get a file like this :

    $ ffmpeg -i ~/NoSetCaptureRate.mp4 
    
...
    
Seems stream 0 codec frame rate differs from container frame rate: 180000.00 (180000/1) -> 90000.00 (180000/2)
    
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/home/mspitz/NoSetCaptureRate.mp4':
    
  Metadata:
    
    major_brand     : isom
    
    minor_version   : 0
    
    compatible_brands: isom3gp4
    
    creation_time   : 2013-06-04 00:50:41
    
  Duration: 00:00:04.87, start: 0.000000, bitrate: 2803 kb/s
    
    Stream #0.0(eng): Video: h264 (Baseline), yuv420p, 720x480, 2801 kb/s, PAR 65536:65536 DAR 3:2, 16.01 fps, 90k tbr, 90k tbn, 180k tbc
    
    Metadata:
    
      creation_time   : 2013-06-04 00:50:41

    Note that the Duration is as expected, about 5 seconds. The video also plays at a normal speed.

    I'm using setCaptureRate(30f) because 30 frames per second is the value of my CamcorderProfile's videoFrameRate. On my Galaxy Nexus S2 (4.2.1), omitting setCaptureRate() is fine, but when I tested on a Galaxy Nexus S3 (4.1.1), omitting setCaptureRate() results in the ever-helpful "start failed -22" error when I called mMediaRecorder.start().

    So, what am I missing ? I thought that the capture rate and the video frame rate were independent, but it's clear that they're not. Is there a way to determine programmatically what I need to set the capture rate at in order to determine that my video plays back at 1x speed ?

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