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• How can I change an animation into .mp4 video in android ?

  15 août 2016, par littlebird

  Here is the problem. First I have some pictures and I have built an animation in ImageView so that pictures can fade in and fade out, with rotating, scaling...
  Question is how to save it (or how to change this animation into .mp4 or other format). I have searched this problem in SO, some say using ffmpeg, or javaCV, or jcodec. But all these way save images to video one frame by one frame, I don’t understand how to completely save the rotating, scaling during each fading in and fading out. Or is there any way else to do so ?
  Thanks in advance.

• Converting a video and capturing a thumbnail through ffmpeg-php

  14 mai 2014, par HackerManiac

  Can anyone give a code on how do i upload and covert a video using ffmpeg.

  As thought currently i have only uploading system.

  vu.php

  define('UPLOAD','../../videos/');
  
      $fileName = time().$file['name']; 
  
      $target = UPLOAD.$fileName;
  
  
  
    if(move_uploaded_file($file['tmp_name'],$target)){                
  
        exec("ffmpeg -i ".UPLOAD." ".UPLOAD.$filename.".flv"); 
  
    }

  This pice of code block just uploads the video on video folder but does not converts it to .flv.
  I am not sure how to use ffmpeg.

  My diretory looks like this

  www[localhost]->videos[videos folder]
  
  www[localhost]->pictures[pictures folder]
  
  www[localhost]->resources[folder]->php[folder]->vu.php

  I also want to return a .jpg image of any frame of video through json by converting via ffmpeg and uploading it to pictures folder.

  return json_encode(array("thumbnail"=>$image_src));

• avcodec/mpeg12dec : Don't adapt (last|next)_pic.linesize for field pics

  23 juin 2024, par Andreas Rheinhardt

  avcodec/mpeg12dec : Don't adapt (last|next)_pic.linesize for field pics
  These values are not read anywhere. Furthermore, since commit
  
  fe6037fd04db8837dcdb9013f9c4ad4e7eb0592e the linesize values
  
  of the MPVWorkPictures were wrong for subsequent fields
  
  in a chain of B-pictures (as they are always doubled and no longer
  
  based upon the frame-linesizes) which can eventually lead to overflow.
  Finally, it makes no real sense to ever double the linesize
  
  of the reference pictures at all : Even when the current picture
  
  is a field, it can still reference both fields of reference
  
  pictures and therefore the linesize should allow to address
  
  both fields (for the same reason, data is not offset for
  
  reference pictures).
  libavcodec/mpeg12dec.c:1304:41 : runtime error : signed integer overflow : 4611686018427387904 * 2 cannot be represented in type 'long'
  issue : 69732/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_MPEGVIDEO_fuzzer-5123551179374592
  Reviewed-by : Michael Niedermayer <michael@niedermayer.cc>
  
  Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
  

  • [DH] libavcodec/mpeg12dec.c