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• Does simple rescaling from 1080p to frame height of 720 lead to 720p ?

  12 août 2015, par nburk

  I want to convert a 1080p to 720p and also lower resolutions eventually.

  I have been using ffmpeg for all my video processing activities so far, and would simply approach this task using the following command :

  ffmpeg -i tos.mov -vf scale=-1:720 tos_0x720.mov

  I understand that this will rescale my video to a new frame size having 720 pixels set as a fixed height and the width dynamically calculated.

  What I am not sure about are the implications regarding the quality factors of the video when using ffmpeg this way.

  1. Is it valid to assume that running this command will output a perfect HD 720p quality video ?
  2. What would be a benefit of using dedicated video conversion software to accomplish my goal compared to running the above command ?

• ffprobe failed to execute command

  31 août 2020, par Ted Bed

  I'm trying to get a frame from a video in a temp location but I get an error like this :

  


  Uncaught Alchemy\BinaryDriver\Exception\ExecutionFailureException: ffprobe failed to execute command '/usr/bin/ffprobe' '/tmp/phpfwEh9u' 


  


  Which is weird because I have another script that does the exact same thing but there is no error. Are there any reasons for why this could be happening ? Could there be any factors causing this in my script :

  


  $sec = 1;
$movie =  $filentmpname;
$thumbnail = 'thumbnail_uploads/' . $imfileid;

$ffmpeg = FFMpeg\FFMpeg::create();
$video = $ffmpeg->open($movie);
$frame = $video->frame(FFMpeg\Coordinate\TimeCode::fromSeconds($sec));
$frame->save($thumbnail);


  


• dotnet core media trans-coding library

  18 juin 2020, par Faisal Shahin

  I'm searching for a library for media transcoding other than ffmpeg for dotnet core the thing I'm searching for is for media streaming of videos.

  



  The ffmpeg is great but there is no library that will enable me to save the transcoded vedio to a stream object, plus when tested the conversion of the video using ffmpeg it took too much time (of course depending on multiple factors).

  



  so Im wondering if there is a dotnet core library other than those who uses ffmpeg that do the same thing but with more performance and the ability to save the output to a stream object