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• Android mp4 remove rotation and rotate the video stream

  6 novembre 2018, par Mathijs Segers

  I’m having some issues trying to remove the rotation value of Android video’s.
  For some reason convertion tools in the cloud cannot seem to handle android’s rotation value correctly. f/e I have a portrait video recorded in 1080x1920 (so the file’s headers tell me it’s actually 1920x1080 with rotation : 90).

  So now I’m trying to convert these video’s to an actual 1080x1920 format when they have this rotation value but i’m kind of stuck, probably using the wrong search terms on SO and Google.

  In the hope of making things clear I’ve actually added some ffmpeg libs to android following these steps, of course with some changes to parameters. I’m building this on a Mac and this all works fine now.
  http://www.roman10.net/how-to-build-ffmpeg-with-ndk-r9/

  Now the following, I have no real clue how these libs work and how to use them or which I actually need or if I even need them at all.

  Is there anyone who can point me in the right direction of solving my issue ? Basicly the video’s are on my android filesystem and I can access them fully, before uploading I want to check the values and remove and rotate the video’s if needed.

• Create hls stream in Google Cloud Functions (ffmpeg)

  3 novembre 2018, par Markus

  I tried for several hours with no good outcome.

  I want to create an hls stream (from a mp4 video) with the help of google cloud functions.

  This is what i have come up with so far :

    const remoteReadStream = myBucket.file(vidPath).createReadStream();
  
    const remoteWriteStream = myBucket.file(vidPath.replace('.mp4', '.m3u8')).createWriteStream();
  
  
  
  
  
    var proc = ffmpeg()
  
      .input(remoteReadStream)
  
    // Base url
  
    // include all the segments in the list
  
    .addOption('-hls_time',4)
  
    .addOption('-c:a aac')
  
    .addOption('-ar 48000')
  
    .addOption('-c:v h264')
  
    .addOption('-profile:v main')
  
    .addOption('-crf 20')
  
    .addOption('-sc_threshold 0')
  
    .addOption('-g 48')
  
    .addOption('-keyint_min 48')
  
    .addOption('-hls_playlist_type vod')
  
    .addOption('-b:v 800k')
  
    .addOption('-maxrate 856k')
  
    .addOption('-bufsize 1200k')   
  
    .addOption('-b:a 96k')
  
    .addOption('-hls_segment_filename', 'this_is_not_working_%03d.ts') 
  
                *tried gs://.../videos/$03d.ts' as well as other paths...
  
    .outputOptions('-f hls')
  
    .on('progress', function(progress) {
  
  
  
      var processing_str = 'Processing:' + progress.percent + '% done';
  
      console.log(processing_str);
  
    })
  
    .on('end', function() {
  
      console.log('file has been ffmpeg succesfully');
  
    })
  
    .on('error', (err, stdout, stderr) => {
  
        console.error('An error occured during encoding', err.message);
  
        console.error('stdout:', stdout);
  
        console.error('stderr:', stderr);
  
      })
  
    .pipe(remoteWriteStream, { end: true });

  This will give me the m3u8 file but the header files (ts files) will not be created, cause of the failure of saving them. The m3u8 file is saved, because it is a stream.

  Opening ’xxx.ts’ for writing Could not write header for output file #0 (incorrect codec parameters ?)

  I want to save them in the same folder, but I cannot access it by the bucket.
  Does anyone know, how to ’create’ multiple files (give the excact path of my bucket) in the ffmpeg configuration ?

  Maybe saving them as a stream would be the answer, but i have no clue how to pass that stream (.createWriteStream() ;) as an argument.

  Thanks in advance

• batch convert videos with ffmpeg while copying other files in folder hierarchy

  9 novembre 2022, par jan

  I have a large video archive in a hierarchical folder structure that includes audio and other files alongside the videos. I would like to replicate the entire structure onto a different disk while converting the videos with ffmpeg to .mp4 format (original is .mov). I figured out the settings for converting to .mp4 :

  



  for f in /path/to/archive/*/*/*.mov; do ffmpeg -i "$f" –c:v libx264 –preset superfast –crf 18 –pix_fmt yuv420p –coder vlc –refs 1 –qmin 4 –c:a libvo_aacenc –b:a 256k –ar 48000 "${f%.mov}.mp4"; done


  



  But now I have no clue how to
  
(a) place the converted .mp4 file into a parallel folder structure onto a different disk,
  
(b) also copy other files in the structure over.

  



  The structure looks like this :

  



  Archive
    2013-05-01
        2013-05-01_08.51.10
            2013-05-01_08.51.10.mov
            2013-05-01_08.51.10.wav
            2013-05-01_08.51.10.txt
        2013-05-01_09.23.47
            2013-05-01_09.23.47.mov
            2013-05-01_09.23.47.wav
            2013-05-01_09.23.47.txt
            2013-05-01_09.23.47.jpg
            (sometimes there are other files and subdirectories too)
        2013-05-01_09.25.23
            ... 
    2013-05-02
        2013-05-02_08.51.10
            2013-05-02_08.51.10.mov
            2013-05-02_08.51.10.wav
            2013-05-02_08.51.10.txt
    ...


  



  Each folder has one video, one wav, one txt, and possibly some other files or subfolders. I would like to replicate the entire structure while replacing the .mov files with converted .mp4 versions.
  
Help is greatly appreciated !