Recherche avancée

Sur d’autres sites (8341)

• Loseless FFMPEG compression that supports windows media player

  12 juin 2018, par nmr

  I am trying to create a movie file (avi, mp4, etc as long as it support windows media player) from a sequence of png files using ffmpeg.I am using C++ "System("ffmpeg command")" to create the movie files once I create the png files (this shouldn’t effect movie creation). I was able to create a .avi file using the following command,

  ffmpeg.exe -r 30 -i frame_%7d.png test1.avi

  Once you create the file it runs in windows media player but does not run in VLC. I have realized, it does lossy compression and the movie is not that high quality (quality decreases with frame rate). I want to have lossless compression (or no compression at all) but needs to be able to play in windows media player. So I tried the following commands,

  ffmpeg.exe -framerate 30 -i frame_%7d.png -codec copy test2.avi

  This file ran in VLC but didn’t run in windows media player. Then I tried put in "-pix_fmt yuv420p" but still couldn’t get it to run in windows media player.

  ffmpeg.exe -framerate 30 -pix_fmt yuv420p -i frame_%7d.png -codec copy test2.avi

  I have also tried using "ffv1" codec and it ran in VLC but not in windows media player

  ffmpeg.exe -i frame_%7d.png -c:v ffv1 -qscale:v 0 test4.avi

  So, how do I create a lossless movie file from a sequence of png files using ffmpeg that will run in windows media player ?

• ffmpeg reverse video resolution after compression

  30 août 2018, par Mehran

  I’m trying to compress a video to mp4 format with ffmpeg.

  With scale filter :

  cmd = "-i, "+in+" -vf scale=480:-2,setsar=1:1, "+out;

  Or as simple as this :

  cmd = "-i, "+in+" "+out;

  If I try this command, the outPut will be fine in many players like potPlayer(win) or mxPlayer(android), But in some players like kmPlayer.v3(win) it’s stretched. with or without scale filter.

  I tried the same video compression with Handbrake so I find out there is nothing wrong with my player.

  The result is the same with all videos that I compressed with ffmpeg library

  And there is another problem which is more annoying, the outPut video resolution gets reversed. for Example :

  Input : w1280 h720

  Output : w720 h1280

  I googled a lot but I found nothing.

• Fails to crop video with ratio height = width using FFMpeg on Android 7

  18 avril 2018, par Babs

  I am using FFMpeg Android this link in our Android app

  crop the video to 1:1 ratio i.e height = width

  The below command works great on Android devices with Api < 24 but Fails on Api 24. I have also pasted my log analysis below, appreciate if anyone can help me fixing this issue.

  public static String cropVideo(final Context context, final File file, final BaseCaptureInterface mBaseCaptureListener) {
  
      String croppedUrl = "";
  
      FFmpeg ffmpeg = FFmpeg.getInstance(context.getApplicationContext());
  
      try {
  
          croppedUrl = file.getParent() + "/Cropped_" + file.getName();
  
          String[] cmds = {"-i", file.getAbsolutePath(), "-vf", "crop=out_h=in_w", "-threads", "5", "-preset" ,"ultrafast","-strict","-2",croppedUrl};
  
  
  
          ffmpeg.execute(cmds, new ExecuteBinaryResponseHandler() {
  
  
  
              @Override
  
              public void onStart() {
  
                  Log.d(TAG, "cropVideo:onStart()");
  
              }
  
  
  
              @Override
  
              public void onProgress(String message) {
  
                  Log.d(TAG, "cropVideo:onProgress(): " + message);
  
              }
  
  
  
              @Override
  
              public void onFailure(String message) {
  
                  Log.d(TAG, "cropVideo:onFailure(): " + message);
  
                  Toast.makeText(context, "Failed to Crop the video", Toast.LENGTH_SHORT).show();
  
              }
  
  
  
              @Override
  
              public void onSuccess(String message) {
  
                  file.delete();
  
                  mBaseCaptureListener.videoCropStatus(true);
  
                  Log.d(TAG, "cropVideo:onSuccess(): " + message);
  
              }
  
  
  
              @Override
  
              public void onFinish() {
  
                  Log.d(TAG, "cropVideo:onFinish()");
  
              }
  
          });
  
      } catch (FFmpegCommandAlreadyRunningException e) {
  
          Log.d(TAG, "cropVideo:error: " + e);
  
      }
  
      return croppedUrl;
  
  }

  Observation : Below is the comparison of Pass and Fail logs during onProgress() of cropping. in Fail Logs, the frame initial is 0 and then abruptly jumps to 2392 also the size increases proportionately. Whereas in the Pass logs, the increase in frame and size is quite smooth.
  I am wondering if my command string[] needs some changes. Please, let me know if you have any suggestions.

  Pass Logs :

   Press [q] to stop, [?] for help
  
   frame=    0 fps=0.0 q=0.0 size=       0kB time=00:00:01.00 bitrate=   0.4kbits/s speed=1.97x    
  
   frame=   18 fps= 18 q=0.0 size=       0kB time=00:00:01.34 bitrate=   0.3kbits/s dup=9 drop=0 speed=1.33x    
  
   frame=   26 fps= 17 q=0.0 size=       0kB time=00:00:02.00 bitrate=   0.2kbits/s dup=13 drop=0 speed=1.33x    
  
   frame=   48 fps= 18 q=0.0 size=       0kB time=00:00:02.00 bitrate=   0.2kbits/s dup=24 drop=0 speed=0.744x    
  
   frame=   48 fps= 15 q=0.0 size=       0kB time=00:00:02.60 bitrate=   0.1kbits/s dup=24 drop=0 speed=0.814x    
  
   frame=   58 fps= 15 q=29.0 size=      25kB time=00:00:03.00 bitrate=  68.1kbits/s dup=29 drop=0 speed=0.802x    
  
   frame=   62 fps= 14 q=29.0 size=      45kB time=00:00:03.00 bitrate= 122.6kbits/s dup=31 drop=0 speed=0.679x    
  
   frame=   68 fps= 14 q=29.0 size=      68kB time=00:00:03.00 bitrate= 184.3kbits/s dup=34 drop=0 speed=0.608x    
  
   frame=   74 fps= 13 q=29.0 size=      96kB time=00:00:03.00 bitrate= 262.1kbits/s dup=37 drop=0 speed=0.534x    
  
   frame=   79 fps= 13 q=29.0 size=     119kB time=00:00:03.00 bitrate= 324.3kbits/s dup=39 drop=0 speed=0.482x   
  
  frame=   81 fps= 12 q=29.0 size=     131kB time=00:00:03.20 bitrate= 335.2kbits/s dup=40 drop=0 speed=0.475x   
  
   frame=   81 fps= 11 q=29.0 size=     131kB time=00:00:03.98 bitrate= 268.9kbits/s dup=40 drop=0 speed=0.551x   
  
   frame=   92 fps= 12 q=29.0 size=     197kB time=00:00:04.01 bitrate= 402.0kbits/s dup=45 drop=0 speed=0.516x   
  
   frame=   96 fps= 11 q=29.0 size=     222kB time=00:00:04.01 bitrate= 452.9kbits/s dup=47 drop=0 speed=0.479x   
  
   frame=  101 fps= 11 q=29.0 size=     245kB time=00:00:04.01 bitrate= 499.8kbits/s dup=49 drop=0 speed=0.44x    
  
   frame=  105 fps= 11 q=29.0 size=     268kB time=00:00:04.01 bitrate= 546.6kbits/s dup=51 drop=0 speed=0.414x  
  
   frame=  112 fps= 11 q=29.0 size=     310kB time=00:00:04.09 bitrate= 620.0kbits/s dup=54 drop=0 speed= 0.4x    
  
   frame=  115 fps= 10 q=29.0 size=     326kB time=00:00:04.09 bitrate= 652.1kbits/s dup=55 drop=0 speed=0.374x  
  
   frame=  119 fps= 10 q=29.0 size=     355kB time=00:00:04.09 bitrate= 710.8kbits/s dup=57 drop=0 speed=0.355x  
  
   frame=  119 fps=7.1 q=-1.0 Lsize=     671kB time=00:00:04.13 bitrate=1327.9kbits/s dup=57 drop=0 speed=0.245x
  
   video:604kB audio:62kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.717086%
  
   [libx264 @ 0xb5b08800] frame I:1     Avg QP:23.35  size: 24768
  
  
  
  
  
  Fail Logs:
  
  
  
     Stream #0:1 -> #0:1 (aac (native) -> aac (native))
  
   Press [q] to stop, [?] for help
  
   frame=    0 fps=0.0 q=0.0 size=       0kB time=00:00:00.81 bitrate=   0.5kbits/s speed=1.61x    
  
   frame=    0 fps=0.0 q=0.0 size=       0kB time=00:00:01.57 bitrate=   0.2kbits/s speed=1.56x    
  
   frame=    0 fps=0.0 q=0.0 size=       0kB time=00:00:02.30 bitrate=   0.2kbits/s speed=1.51x    
  
   frame=    0 fps=0.0 q=0.0 size=       0kB time=00:00:03.22 bitrate=   0.1kbits/s speed=1.58x    
  
   frame=    0 fps=0.0 q=0.0 size=       0kB time=00:00:04.13 bitrate=   0.1kbits/s speed=1.63x    
  
   frame=    0 fps=0.0 q=0.0 size=       0kB time=00:00:04.90 bitrate=   0.1kbits/s speed=1.61x    
  
   frame=    0 fps=0.0 q=0.0 size=       0kB time=00:00:05.82 bitrate=   0.1kbits/s speed=1.64x    
  
   frame= 2392 fps=111 q=22.0 size=    1059kB time=00:01:19.61 bitrate= 109.0kbits/s dup=2389 drop=0 speed=3.68x    
  
   frame= 2416 fps=109 q=27.0 size=    1059kB time=00:01:20.41 bitrate= 107.9kbits/s dup=2390 drop=0 speed=3.63x    
  
   frame= 2438 fps=108 q=27.0 size=    1059kB time=00:01:21.14 bitrate= 106.9kbits/s dup=2390 drop=0 speed=3.58x    
  
   frame= 2462 fps=106 q=26.0 size=    1060kB time=00:01:21.94 bitrate= 105.9kbits/s dup=2393 drop=0 speed=3.54x    
  
   frame= 2484 fps=105 q=25.0 size=    1060kB time=00:01:22.68 bitrate= 105.0kbits/s dup=2395 drop=0 speed= 3.5x    
  
   frame= 2506 fps=104 q=24.0 size=    1060kB time=00:01:23.41 bitrate= 104.1kbits/s dup=2397 drop=0 speed=3.45x    
  
   frame= 2530 fps=103 q=26.0 size=    1060kB time=00:01:24.21 bitrate= 103.1kbits/s dup=2397 drop=0 speed=3.41x    
  
   frame= 2554 fps=101 q=25.0 size=    1061kB time=00:01:25.01 bitrate= 102.2kbits/s dup=2399 drop=0 speed=3.38x    
  
   frame= 2577 fps=100 q=26.0 size=    1167kB time=00:01:25.78 bitrate= 111.4kbits/s dup=2399 drop=0 speed=3.34x    
  
   frame= 2588 fps= 99 q=-1.0 Lsize=    4707kB time=00:01:26.35 bitrate= 446.6kbits/s dup=2399 drop=0 speed=3.32x    
  
   video:4590kB audio:101kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.346620%