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• grab_image is not working for HD videos ?

  21 février 2012, par user1222769

  I am using ffmpeg command for grab_image of converted videos which are in flv format. All videos images are created except for HD videos. The code which i have written is as follws. Thanks in advance.

  function grab_image($filename, $rootpath, $inputpath,$outputpath, $no_of_thumbs, $frame_number, $image_format, $width, $height)
  
  
  
  
  
      $_rootpath = $rootpath."\ffmpeg";
  
      // Media Size
  
      $size = $width."x".$height;
  
  
  
      // I am using static image, you can dynamic it with your own choice.
  
      $out=explode(".",$filename);
  
  
  
      $outfile = $out[0].".jpg";
  
  
  
      //$ffmpegcmd1="ffmpeg -i ".$inputpath."/".$filename." -ss 1.4 -vframes 1 -f image2 ". $outputpath."/".$outfile;
  
  
  
          // in local
  
  
  
             $ffmpegcmd1="D:/xampp/htdocs/abc/ffmpeg -i ".$inputpath."/".$filename." -r 1 -ss 1.4 -vframes 1 -f image2 ". $outputpath."/".$outfile;
  
      $ret = exec($ffmpegcmd1);
  
  
  
      // Execute this command using exec command or any other tool to grab image from converted flv file.
  
      return $ffmpegcmd1;
  
  }
  

• NodeJS FFMPEG : Issues combining the crops and the trims

  18 mars 2024, par Lqmnn B.

  I'm building a video editor where I can trim multiple clips and adjust the videos by cropping each clip. For example the first clip is centered in the middle and the second clip would be centered at the very right (for more details it's to crop a vertical format from a landscape video). And the goal is obviously to merge every clip in the end into one video.

  


  I currently use this to trim and crop. :

  


  // Constructing the filter string dynamically based on trim times
            const filterString = metadata.trim_times.map(({ start, end }) => `between(t,${start},${end})`).join('+');

            // FFMPEG command to trim the video based on the dynamic filter string
            await ffmpeg.current?.run(
                '-i', 'input.mp4',
                '-vf', `select='${filterString}',setpts=N/FRAME_RATE/TB,crop=(ih*9)/16:ih:${sliderValue}-((ih*9)/32):(in_h-out_h)/2`,
                '-af', `aselect='${filterString}',asetpts=N/SR/TB`,
                'output.mp4'
            );


  


  An idea I had was to loop my filterString const and trim/crop but then to concat i don't really know if that exists :/

  


  I'd love to have some help with that, and please ask me if you need more details on the code 🙂
Thanks in advance !

  


• libavcodec/qsvenc : Flush cached frames before reset encoder

  13 février 2023, par Wenbin Chen

  libavcodec/qsvenc : Flush cached frames before reset encoder
  According to https://github.com/Intel-Media-SDK/MediaSDK/blob/master/doc/mediasdk-man.md#configuration-change.
  
  Before calling MFXVideoENCODE_Reset, The application needs to retrieve
  
  any cached frames in the SDK encoder.
  
  A loop is added before MFXVideoENCODE_Reset to retrieve cached frames
  
  and add them to async_fifo, so that dynamic configuration works when
  
  async_depth > 1.
  Signed-off-by : Wenbin Chen <wenbin.chen@intel.com>
  

  • [DH] libavcodec/qsvenc.c