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• mp4 And Rotation - Remove Flags But Set Rotation

  7 avril 2024, par Bud

  I'm having a hard time with the rotation on some mp4 files I have. It may well be my poor understanding, so forgive me if I set out what I know (or think I know) and then what I want to happen.

  


  An mp4 has, obviously, a right way up - that is, the way you want it to show when you watch it. Call this the orientation. This isn't metadata - it's just the way you, as a person, want to see the image, with people's heads at the top of the screen and their feet at the bottom.

  


  As part of the metadata, mp4 files have a value/parameter (I believe called 'rotate') that tells how much the mp4 needs to be rotated (0, 90, 180, 270 degrees) so that it is correctly oriented. This value/parameter is observed by some players and not by some others. So if I play my video using this player, all is good (because it observes the value/parameter) - but if I play it with that other player, everything is sideways (because it doesn't observe the value/parameter).

  


  What I want to do is orient the mp4 correctly with the value/parameter set to 0, so that no matter what player plays it, it will always be played oriented correctly (because those players that observe the value/parameter will see it's 0 and do nothing). So I think what I need to do is somehow remove the value/parameter, then rotate the mp4 to the correct orientation without using the rotate value/parameter. I'm thinking of something like what FastStone Image Viewer can do with JPGs - rotate them losslessly without setting the rotate value.

  


  I've used ffmpeg and believe that it removed the rotate value/parameter (or set it to 0) because after I used it, suddenly my video appeared sideways in Windows Explorer, where previously it had appeared right way up. But how do I now rotate it to the correct orientation without changing the rotate value/parameter ?

  


  Sorry, this is very long winded and confused. Just like me.

  


• Merging .flv chunks from stream site

  4 décembre 2016, par Iztooi

  I’m trying to download a video from an alternative version of the Ustream site. This site is apparently used for a DRM protection, in fact you can’t watch this video without having access to it through a login from this site.
  The video system should be the same used by ustream (same links), that is calling different flv chunks every x seconds and merging them into the stream (similar to an rtmp service, but it doesn’t use this protocol).

  I managed to download every .flv chunks composing this video, but i had issues on merging them into a single file. First of all these flvs files have some audio/video lags/problems, but since there is no other way to download this video i’m not complaining about lags.

  The real issue is that every flv file has an additive increase on the duration, despite having a normal size. Video duration is about 6 seconds, so the first chunk is 6 seconds long, the second chunk is 12 seconds long, although only the first 6 are visible (the remaining 6 are "corrupted"). If i try to merge (with ffmpeg or any video-joining software) all these files (about 600-700, for a total duration of 1 hour and 15 minutes) only the first two sections are visible, then I cannot see anything. (Being more clear, if i try to merge the first 2 chunks, file is 18 seconds long and i can see the first 12 ; if i try to merge the first 3 chunks, file is 36 seconds long and i can still only see the first 12 seconds.)

  Anyone has any idea ?

• >SOLVED My FFMPEG throws me unexpected errors while writing a Thumbnail to the songs

  22 février 2019, par Harmonised7

  My issue was that my songs already had a thumbnail. Solution to overwrite thumbnail below !

  I am using Node to execute my ffmpeg. I use this wrapper :

  https://www.npmjs.com/package/ffmpeg

  Everything was fine when I was using smaller versions of the thumbnails provided by Youtube, but when I attempted the HD ones, it suddenly started giving me an error. I’ve tried -pix_fmt yuv422p and Many other pixel formats, but nothing helped. Though ONE out of 100+ songs did tag successfully.

  here is my code :

  downloadTags(tags.thumbnail, `./thumbnails/${tags.title}.jpg`).then(thumbnail =>
  
                      {
  
                          video.addCommand('-i', `"${thumbnail}"`);
  
                          video.addCommand('-map', '0');
  
                          video.addCommand('-map', '1');
  
                          video.addCommand('-c', 'copy');
  
                          video.addCommand('-c:v:1', 'png');
  
                          video.addCommand('-disposition:v:0', 'attached_pic');
  
                          if(tags.title)
  
                              video.addCommand('-metadata', `title="${tags.title}"`);
  
                          if(tags.artist)
  
                              video.addCommand('-metadata', `artist="${tags.artist}"`);
  
                          if(tags.id)
  
                              video.addCommand('-metadata', `comment="https://www.youtube.com/watch?v=${tags.id}"`);
  
                          video.addCommand('-pix_fmt', `yuv422p`);
  
  
  
  
  
                          var output = 'downloaded'
  
                          if (outFolder)
  
                          {
  
                              output = outFolder;
  
                              if(!fs.existsSync(output)) fs.mkdirSync(output);
  
                          }
  
  
  
                          video.save(`"./${output}/${tags.title}.${tags.format}"`, function (error, file) 
  
                          {
  
                              if (error)
  
                              {
  
                                  resolve(error);
  
                                  return
  
                              }
  
                              try
  
                              {
  
                                  fs.unlinkSync(song);
  
                              }
  
                              catch(err)
  
                              {
  
                                  console.log(err.code);
  
                              }
  
                              resolve();
  
  
  
                          });
  
                      });
  
  
  
                  }

  and here is my error :

  E

  RROR: Error: Command failed: ffmpeg -i "songs/&I feat. Giggly Maria - Dive (Exiark's Endless Sky Remix) [Chillstep].m4a" -y  -i "./thumbnails/&I feat. Giggly Maria - Dive (Exiark's Endless Sky Remix) [Chillstep].jpg" -map 0 -map 1 -c copy -c:v:1 png -disposition:v:0 attached_pic -metadata title="&I feat. Giggly Maria - Dive (Exiark's Endless Sky Remix) [Chillstep]" -metadata artist="AReallyLongAndAwesomeNameThatIsBetterThanYoursInEveryPossibleWay" -metadata comment="https://www.youtube.com/watch?v=HprdvIIpR-I" "./written/&I feat. Giggly Maria - Dive (Exiark's Endless Sky Remix) [Chillstep].m4a"
  
  ffmpeg version N-93214-g7e4d3dbe18 Copyright (c) 2000-2019 the FFmpeg developers
  
    built with gcc 8.2.1 (GCC) 20190212
  
    configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libdav1d --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-libvidstab --enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex --enable-libxvid --enable-libaom --enable-libmfx --enable-amf --enable-ffnvcodec --enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec --enable-dxva2 --enable-avisynth --enable-libopenmpt
  
    libavutil      56. 26.100 / 56. 26.100
  
    libavcodec     58. 47.102 / 58. 47.102
  
    libavformat    58. 26.101 / 58. 26.101
  
    libavdevice    58.  6.101 / 58.  6.101
  
    libavfilter     7. 48.100 /  7. 48.100
  
    libswscale      5.  4.100 /  5.  4.100
  
    libswresample   3.  4.100 /  3.  4.100
  
    libpostproc    55.  4.100 / 55.  4.100
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 000002213366bb00] stream 0, timescale not set
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'songs/&I feat. Giggly Maria - Dive (Exiark's Endless Sky Remix) [Chillstep].m4a':
  
    Metadata:
  
      major_brand     : M4A
  
      minor_version   : 512
  
      compatible_brands: isomiso2
  
      title           : &I feat. Giggly Maria - Dive (Exiark's Endless Sky Remix) [Chillstep]
  
      artist          : Cider Party
  
      encoder         : Lavf58.18.104
  
      comment         : https://www.youtube.com/watch?v=HprdvIIpR-I
  
    Duration: 00:05:24.80, start: 0.000000, bitrate: 127 kb/s
  
      Stream #0:0(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 125 kb/s (default)
  
      Metadata:
  
        handler_name    : SoundHandler
  
      Stream #0:1: Video: mjpeg (Baseline), yuvj420p(pc, bt470bg/unknown/unknown), 120x90 [SAR 1:1 DAR 4:3], 90k tbr, 90k tbn, 90k tbc
  
  Input #1, image2, from './thumbnails/&I feat. Giggly Maria - Dive (Exiark's Endless Sky Remix) [Chillstep].jpg':
  
    Duration: 00:00:00.04, start: 0.000000, bitrate: 1575 kb/s
  
      Stream #1:0: Video: mjpeg (Baseline), yuvj420p(pc, bt470bg/unknown/unknown), 480x360 [SAR 1:1 DAR 4:3], 25 tbr, 25 tbn, 25 tbc
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (copy)
  
    Stream #0:1 -> #0:1 (copy)
  
    Stream #1:0 -> #0:2 (mjpeg (native) -> png (native))
  
  Press [q] to stop, [?] for help
  
  [swscaler @ 00000221353d4fc0] deprecated pixel format used, make sure you did set range correctly
  
  [ipod @ 00000221336703c0] Could not find tag for codec png in stream #2, codec not currently supported in container
  
  Could not write header for output file #0 (incorrect codec parameters ?): Invalid argument
  
  Error initializing output stream 0:2 --
  
  Conversion failed!

  Keep in mind that All of my thumbnails retrieved are .jpg

  Any suggestions ? Getting really desperate at this point...