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• Is it possible to change resolution in second pass for ffmpeg multipass encodes ;x264 and x265 ?

  30 mai 2017, par Karthik M

  I have been using the following commands for two pass encodes

  ffmpeg -i <input /> -c:v libx265 -x265-params pass=1:crf=22 -f mp4 /dev/null
  
  ffmpeg -i <input /> -c:v libx265 -x265-params pass=2 <output>
  
  </output>

  If i try changing resolution in second pass with vf scale

  ffmpeg -i <input /> -vf scale=720:-2 -c:v libx265 -x265-params pass=2 <output>
  
  </output>

  i get `

  [Error]CU-tree frame type 87 doesn’t match actual frame type 0.

  `

  EDIT 1 : x264 and x265 have been around for years did someone not find a solution/hack to having multiple output resolutions using stats from first pass at a different resolution, atleast bitrate distribution would look same i presume

• How to transcode a video to custom resolution using Xamarin.MP4Transcoder.Transcoder

  7 juillet 2017, par Prashant

  I need to transcode a video to 640*480 resolution using Xamarin.MP4Transcoder.Transcoder. Currently there are 2 available resolutions 720pFormat and 960x540Format. There is a method called Transcoder For (IMediaFormatStrategy strategy) available in Transcoder class.

  I can create MediaFormat object with MIME Type, Width and Height
  by below mentioned code snippet :

  MediaFormat obj = MediaFormat.CreateVideoFormat("video/mp4", 480, 640);


  but the problem is how can assign it to IMediaFormatStrategy or is there any other way to achieve this.

  Piece of code for Transcoding a video:
  
  
  
  Xamarin.MP4Transcoder.Transcoder.For960x540Format().ConvertAsync(inputFile, outputFile, f =>
                                {
                                  onProgress?.Invoke((int)(f * (double)100), 100);

                                  
                                } );
  
  
  
  inputFile: Video file which needs to be transcoded.
  
  outputFile: Resultant file generated after transcoding.

  For more info you can refer https://github.com/neurospeech/xamarin-android-ffmpeg

  Any help is appreciated. Thanks in advance !!

• Resolution switcher for HLS streaming

  19 septembre 2017, par Awais fiaz

  i am trying to add up a quality picker for users to select desired quality on which they want to play the video using video.js.I have tried using 2 or 3 open source plugins all of which were deprecated or having old code which is not supported now and the worst thing is many of the of the files are missing in them.is there any solution to add up quality picker for HLS streaming on video.js ?
  Any help would be much appreciated
  here is my sample code to play HLS streaming USING video.js

  the current plugin i am using is :
  https://github.com/streamroot/videojs-quality-picker

  <video class="video-js" controls="controls" preload="auto" width="640" height="264" data-setup="{}" autoplay="autoplay">
  
    <source src="legend_hls/legend_playlist.m3u8">
  
  
  
    <p class="vjs-no-js">
  
      To view this video please enable JavaScript, and consider upgrading to a web browser that
  
      <a href="http://videojs.com/html5-video-support/" target="_blank">supports HTML5 video</a>
  
    </p>
  
  </source></video>
  
  <code class="echappe-js">&lt;script&gt;<br />
  
    videojs('my-video').qualityPickerPlugin();<br />
  
  &lt;/script&gt;