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• avfilter/vf_datascope : add option to show only subset of components

  17 janvier 2021, par Paul B Mahol

  avfilter/vf_datascope : add option to show only subset of components
  

  • [DH] doc/filters.texi
  • [DH] libavfilter/vf_datascope.c

• show output before making / rendering the output file ffmpeg [closed]

  5 janvier 2021, par Education 4Fun

  I wanna build an editing application using FFmpeg so when someone gives a video and do his operations I wanna show result before starting of rendering like any normal video editing
can some one let me know how it can be shown as all the operations he did should effect the video
like is there any way to do in FFmpeg or what does video editors do to achieve it
Thank you

  


  Aditional info :-
like I made a basic GUI application using pyqt5 with some buttons to rotate, increase audio, increase the speed of the video, conversion b/n multiple types of video formats, and changing aspect ratio. so I just wanna show output before executing / clicking submit for rendering Hope now its a bit clear.

  


  Finally i found the solution

  


  ffplay test.mp4 -af "volume=8.0,atempo=4.0" -vf "transpose=2,transpose=2,setpts=1/4*PTS" -aspect 4:2


  


• Show portrait video to landscape on Videojs player as HLS ffmpeg Laravel

  11 décembre 2020, par TwistCode

  I am currently using the ffmpeg library through laravel sdk. For the landscape videos I have no problem with the scaling filters application, but with the portrait videos I need the video to look like the thumbnail below :

  


  

  


  But when I play the video, the player is distorted.

  


  

  


  Note : It should be noted that when I work with horizontal scales, the player looks good, but the video is distorted.

  


  

  


  

  


  this is my PHP Laravel code implementation

  


              FFMpeg::FromDisk('local')->open($this->media)
            ->exportForHLS()
            ->setSegmentLength(6) // optional
            /*
            ->addFormat($lowBitrate, function ($media) {
                $media->addFilter(function ($filters, $in, $out) {
                    $filters->custom($in, 'scale=854x480,setsar=1,setdar=16:9', $out); // $in, $parameters, $out

                });
            })*/
            // Portrait test
            ->addFormat($lowBitrate, function ($media) { 
                $media->addFilter(function ($filters, $in, $out) {
                    // $filters->custom($in, "scale='w=min(720,trunc((480*33/40*dar)/2+0.5)*2):h=min(480,trunc((704*40/33/dar)/2+0.5)*2)',pad='w=720:h=480:x=(ow-iw)/2:y=(oh-ih)/2',setsar='r=40/33'", $out); // $in, $parameters, $out
                    $filters->custom($in, "scale=239:-1", $out); // $in, $parameters, $out
                });
            })
            /*
            ->addFormat($midBitrate, function ($media) {
                $media->scale(1280, 720);
            })
            ->addFormat($highBitrate, function ($media) {
                $media->scale(1920, 1080);
            })*/
            ->save("public/hls/$video->id/$video->hash_name.m3u8");


  


  This is the command that runs at the server level for portrait videos.

  


  


  [2020-12-10 17:48:17] local.INFO : ffmpeg running command
'/usr/bin/ffmpeg' '-y' '-threads' '12' '-i'
'/home/vagrant/homesteadprojects/maquillate/storage/app/videos_directory/pexels-cottonbro-6054875.mp4'
'-filter_complex' '[0]scale=640 :-2[v0]' '-map' '[v0]' '-vcodec'
'libx264' '-b:v' '1200k' '-g' '48' '-hls_playlist_type' 'vod'
'-hls_time' '6' '-hls_segment_filename'
'/home/vagrant/homesteadprojects/maquillate/storage/app/public/hls/35/NXp9waz4AO5Q14Lu6T3JbjSRY496RrtiPGIz6IOJ_0_1200_%05d.ts'
'-acodec' 'aac' '-b:a' '128k'
'/home/vagrant/homesteadprojects/maquillate/storage/app/public/hls/35/NXp9waz4AO5Q14Lu6T3JbjSRY496RrtiPGIz6IOJ_0_1200.m3u8'

  


  


  I don't really know if my problem is at the server or frontend level, but I would greatly appreciate any contribution.