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• get screenshot from video using ffmpeg

  6 mars 2016, par LocNguyen

  I’m building a Wordpress site that allow admin to upload and attach a video clip to a post. After the video was uploaded successfully, I use ffmpeg to get a screenshot from that video, and that screenshot would be the post featured image.

  In my case, the screenshot was generated successfully. In next step, I use Wordpress function media_sideload_image() to copy that screenshot to WP ’uploads’ folder and make that image as post featured image.

  But for some reasons, the media_sideload_image() returned a WP_Error : http_404. I have checked the url of the temporary screenshot image, but it was valid and display a screenshot nicely.

  In this case, I guess that the media_sideload_image() was called after the ffmpeg command, but at that time, the ffmpeg process has not completely finished so the media_sideload_image() encountered http_404 error.

  So the question is : Is there any way to make sure the screenshot was saved completely before running media_sideload_image() function after that, to avoid http_404 error ?

  Thank you very much !

• Revision eb8c667570 : Force_split on 16x16 blocks in variance partition. Force split on 16x16 block (

  18 mars 2015, par Marco

  Changed Paths :
   Modify /vp9/common/vp9_rtcd_defs.pl

  
   Modify /vp9/encoder/vp9_avg.c

  
   Modify /vp9/encoder/vp9_encodeframe.c

  
   Modify /vp9/encoder/vp9_encoder.h

  
   Modify /vp9/encoder/x86/vp9_avg_intrin_sse2.c

  
  
  Force_split on 16x16 blocks in variance partition.

  Force split on 16x16 block (to 8x8) based on the minmax over the 8x8 sub-blocks.

  Also increase variance threshold for 32x32, and add exit condiiton in
  choose_partition
  (with very safe threshold) based on sad used to select reference frame.

  Some visual improvement near moving boundaries.
  Average gain in psnr/ssim : 0.6%, some clips go up 1 or 2%.
  Encoding time increase (due to more 8x8 blocks) from 1-4%, depending on clip.

  Change-Id : I4759bb181251ac41517cd45e326ce2997dadb577

• Android ICS FFMPEG scale video not working

  20 avril 2015, par Android-Developer

  I am using Guardian Project Android Java FFMPEG library to resize videos. Current code which is working on android 5.0.1 / 5.1.0 / 4.4.4 :

      File fileTmp = getCacheDir();
  
      FfmpegController fc = null;
  
      try {
  
          fc = new FfmpegController(this, fileTmp);
  
      } catch (IOException e) {
  
          e.printStackTrace();
  
      }
  
      String path = Environment.getExternalStorageDirectory().getPath() + "/Movies/nexus.mp4";
  
      final String outPath = Environment.getExternalStorageDirectory().getPath() + "/Movies/test.mp4";
  
      final Clip out = new Clip(path);
  
      try {
  
          if (fc != null) {
  
              fc.convert(out, outPath, new ShellUtils.ShellCallback() {
  
                  @Override
  
                  public void shellOut(String shellLine) {
  
                      Log.e("", "SHELL OUT: " + shellLine);
  
                  }
  
  
  
                  @Override
  
                  public void processComplete(int exitValue) {
  
                      Log.e("", "PROCESS COMPLETE: " + exitValue);
  
                  }
  
              });
  
          }
  
      } catch (Exception e) {
  
          e.printStackTrace();
  
      }

  Using this code on Android 4.0.4 (Ice Cream Sandwich) doesn’t do anything. While testing on other devices exitValue in processComplete is always equal to 0, but on ICS it’s 11. Here is the output in LogCat :

  SHELL OUT: /data/data/org.hardartcore.ffmpeg/app_bin/ffmpeg -y -i /mnt/sdcard/Movies/NEXUS.mp4 -ab 160k -r ntsc-film -vf scale=568:320 -strict -2 /mnt/sdcard/Movies/Test.mp4
  
  PROCESS COMPLETE: 11

  I don’t think it’s something from ffmpeg, more like a problem when the library is trying to execute ffmpeg executable from raw folder in internal memory, but I can’t see any logs or errors which indicate that too.

  So my question is, if there is any mistake which I am doing using / running this code or something which can prevent ffmpeg executable from running on old devices with Android ICS ?

  Thanks in advance !