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• Video codec not supported error when adding audio to mp4

  18 février 2019, par WPMed

  I work on an application which you can use to make still photos move. It’s basically a png sequence to mp4 converter.
  Recently we introduced a feature where users can add sound effects to the video.
  Since we released this feature, some users experience problems with the exported video. When they save the file and try to play it, they get a "Video codec not supported" error message. All they get is a black screen, and the audio playing in the background. I use FFmpeg to add audio (in mp3 format) to the mp4 video.
  Here’s an example video, which plays fine on my Mac and on my Samsung Galaxy S6 and S8, but buggy on Samsung SM-A310F (Android 7.0). This is how it looks like on the device.
  I tried to re-encode this video with all the FFmpeg commands I could find, but none of them seemed to work. Can someone spot something that’s not compatible with Android by analyzing the video I linked ?

• vp9 : enable multi-thread decoding when refreshctx is equal to 0

  11 octobre 2014, par Di Wu

  vp9 : enable multi-thread decoding when refreshctx is equal to 0
  In vp9_decode_frame function, ff_thread_finish_setup is not called
  
  when refreshctx is equal to 0, and the next decoding thread can not
  
  start work until the cunrrent frame has been decoded completely. So
  
  ff_thread_finish_setup needs to be called to enable Multi-thread
  
  decoding in this condition.
  Signed-off-by : Di Wu <di1028.wu@samsung.com>
  
  Signed-off-by : Reynaldo H. Verdejo Pinochet <reynaldo@osg.samsung.com>
  

  • [DH] libavcodec/vp9.c

• Creating Thumbnails From Ffmpeg Hangs Php

  30 octobre 2012, par Piyush Arora

  I have been working on a php webservice, which receives videos(uploaded) from iphone and upload them to Amazon cloudFront. After uploading videos, I need to generate thumbnails for video from the Amazon link generated. I am using ffmpeg with shell_exec command for it. Here is the code for the same :

  public function createThumbnail($userId,$fileUrl,$imageName){
  
      //$imageUrl = 'http://184.168.116.177:81/json_api/json/bin/';
  
      if(!is_dir("images/".$userId)){
  
          mkdir("images/".$userId);
  
      }
  
      // path of installed ffmpeg
  
      $ffmpeg = $_SERVER['DOCUMENT_ROOT'] .'bin/ffmpeg';
  
      $cmd = "$ffmpeg  -itsoffset -1 -i $fileUrl -vcodec mjpeg -vframes 1 -an -f rawvideo -s 320x240 images/".$userId."/".$imageName;
  
  
  
      shell_exec($cmd);
  
  
  
      return "images/".$userId."/".$imageName;
  
  }

  The above code generates the thumbnail, but script does not execute after shell_exec command. So, there is no response sent to iphone end about the thumbnail link. This function works well video is uploaded from web browser of pc. If I comment, shell_exec command, then response is sent to iphone end, but obviousely image is not created.

  Thanks in advance.