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• FFmpeg - Check if all video files have concatenated correctly into one video

  14 mai 2020, par STerrier

  I am concatenating thousands of .ts files into an mp4 which works great but is there a way to know which files have already been concatenated with FFmpeg ?

  



  The issue I have is I am concatenating multiple videos back to back and if the app is closed off during the concatenation process. The concatenating of the videos may not be complete. I can check if the files exist but the size of the files could be wrong if not all the clips have been concatenated. Is there a way to know if all the files have been concatenated properly ?

  



  My current idea is if the app is closed before it has completed concatenating, I would delete the mp4 file and restart concatenating the video again but this time consuming especially if the files concatenated properly the first time.

  



  Any ideas would be great thanks

  



  ffmpegCommand

  



   ffmpeg -f concat -i \(videoFile) -c:v copy -c:a copy \(outputFile)


  



  I am using the cocoa pod mobile-FFmpeg
https://github.com/tanersener/mobile-ffmpeg

  



  Link to FFmpeg Concatenate function
https://trac.ffmpeg.org/wiki/Concatenate

  


• VideoJS seekable().end(0) always returns 0

  18 septembre 2022, par Clovis Nyu

  I am trying to jump to a particular timestamp of a video, but using player.currentTime(someTime) always sends the video back to the start. Upon doing some research, I found that running player.seekable().end(0) always returns 0. I realize that this might be a problem with the fact that I'm using MP4, but I've tried using

  


  ffmpeg -i input.mp4 -c copy -movflags +faststart output.mp4


  


  to fix it and it doesn't work. Below is my code

  


  &#xA;&#xA;    &#xA;&#xA;&#xA;    <source src="http://localhost:8000/some_video.mp4" type="video/mp4"></source>&#xA;    <p class="vjs-no-js">&#xA;        To view this video please enable JavaScript, and consider upgrading to a&#xA;        web browser that&#xA;        <a href="https://videojs.com/html5-video-support/" target="_blank">supports HTML5 video&#xA;    </a></p>&#xA;&#xA;&#xA;<button>Jump</button>&#xA;&#xA;<code class="echappe-js">&lt;script src=&quot;https://vjs.zencdn.net/7.7.5/video.js&quot;&gt;&lt;/script&gt;&#xA;&lt;script&gt;&amp;#xA;    var VIDEO_JS = videojs(&amp;#x27;my-video&amp;#x27;);&amp;#xA;&amp;#xA;    function jump() {&amp;#xA;        VIDEO_JS.currentTime(10);&amp;#xA;    }&amp;#xA;&lt;/script&gt;&#xA;&#xA;

  


  For more context, the videos are taken from youtube, the audio is then split into vocals and accompaniment using spleeter, then ffmpeg is used to merge back the resulting audio files into the original video.

  


  Any help would be appreciated. Thanks !

  


• Problems with modifying encoder metadata with FFMPEG

  19 avril 2024, par yrcje

  I'm trying to change FFMPEG encoder writing application with FFMPEG -metadata and for whatever reason, it's reading the input but not actually writing anything out.

  



  -map_metadata -metadata:s:v:0 -metadata writing_application, basically every single stack overflow and stack exchange thread, but they all won't write to the file at all.

  



  ffmpeg -i x.mp4 -s 1920x1080 -r 59.94 -c:v h264_nvenc -b:v 6000k -vf yadif=1 -preset fast -fflags +bitexact -flags:v +bitexact -flags:a +bitexact -ac 2 x.mp4
ffmpeg -i x.mp4 -c:v copy -c:a copy -metadata Encoder="TeXT Encoder" -fflags +bitexact -flags:v +bitexact -flags:a +bitexact test.mp4
ffmpeg -i x.mp4 -vcodec copy -acodec copy -map_metadata out.mp4
ffmpeg -i x.mp4 -vcodec copy -acodec copy -metadata encoder="Encoder" -metadata comment="XX" testmeta.mp4
ffmpeg -i x.ts -c:v copy -c:a copy -metadata:s:v:0 h264 ISFT='TeXT' x.mp4
ffmpeg -i x.mp4 -i FFMETADATAFILE -map_metadata 1 -codec copy testcopy.mp4
ffmpeg -i x.ts -f ffmetadata FF


  



  METADATAFILE

  



  I tried to extracting the data and rewrite it back with FFMETADATAFILE but it doesn't show up. Tried forcing ffmpeg to write without any emtadata and write it back but doesn't work. Was wondering if I can write my own encoder that writes the specific encoder name, like how Handbrake/Lavf writes the encoder application into the METADATA of the video file. Or just use FFMPEG and modify the METADATA natively.