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• Auto-Transcode/Compress .mkv to .mp4 on Qnap TS-251+

  9 novembre 2020, par DarkDiamond

  I rip my DVDs with MakeMKV in order to be able to watch them on my TV, as I do not have a DVD-player that supports any output connector that fit into my TV as the TV is relatively new whereas the DVD-player is quite old. (As I only use the rips for my personal entertainment and do not share them there is absolutely no copyright problem).

  


  The problem with the output files is the extreme size as they are the raw data from the disk. Now I would like these files to be compressed into a .mp4 file as soon as they are finished. The problem is that the file is created before everything is in it, so I probably need to write it into a local drive and copy it to its destination later. Then I will copy them to my Qnap NAS TS-251+.

  


  There I want it do be compressed into a much smaller .mp4 file (usually the .mp4s are a sixth of the original size). I found something using ffmpeg, so I just need a script that does this for me. I do not mind to use a Docker machine for it, but I do not know how to do it. I found this :

  


  ffmpeg -i input.mkv -c:v -crf 18 -preset veryslow -c:a copy out.mp4 here.

  


  I also found this video, so I know it is in theory possible, I just do not know how to realise it.

  


  In case you ask why I want to use the Qnap NAS, it allows hardware acceleration, whereas my laptop does not.

  


• FFMPEG on Heroku worker dynos takes too long - runs into timeout error

  26 janvier 2021, par John

  I am encoding a large video file that on my 5-year-old laptop runs at 7X and finishes in about 5 minutes. But with 2X worker dynos on heroku it cant even finish before the 4 hour background job time limit. I didn't have any issues until 2 days ago and now its causing lots of probelms. If I run heroku run rails console and run the job manually, I see it start at 7X but then quickly go down to 2X and then 0.5X speed. Anyone know what is causing this issue ?

  


  I'm encoding a VP8 webm file to MP4. If anyone knows a faster way to do this that might also fix this issue that would be great too !

  


  ffmpeg -y -i #{temp_webm_file.path} -movflags faststart -preset ultrafast #{temp_mp4_file.path}

  


• ffmpeg concat vertical video, different dimensions [duplicate]

  16 octobre 2020, par Morris

  Context :
3 input videos :

  


  foo.mov : 1080x1920 (vertical, NOT horizontal) with audio.

  


  bar.mp4 and fiz.mp4 : 480x360, with audio.
(Note : .mp4, differs from .mov)

  


  Goal : to concat all 3 videos. Output out.mp4 should be 480x360. Squeeze foo.mov but keep its aspect ratio, taking up 100% height, but the slim video should stand only in the center, with left and right sides being black (or other color) void. foo.mov should not be cropped.

  


  I currently have this command below (added new-line characters for better visualization) for concating, but need to fill the missing code at PLACEHOLDER1 to generate v0, such that v0 is resized to 480x360 like described above. If my attempt so far is correct, please help complete PLACEHOLDER1 ; else, please offer a better solution with explanation.

  


  ffmpeg 
-r 24 -i foo.mov 
-r 24 -i bar.mp4 
-r 24 -i fiz.mp4
-filter_complex 
"[0:v] PLACEHOLDER1 [v0];
[v0][1][2] concat=n=3:v=1:a=1 [v][a]" 
-map "[v]" -map "[a]" out.mp4


  


  Running

  


  ffmpeg -n -i foo.MOV -i bar.mp4 -i fiz.mp4


  


  gives this info :

  


  ffmpeg version 4.3.1 Copyright (c) 2000-2020 the FFmpeg developers
  built with Apple clang version 11.0.3 (clang-1103.0.32.62)
  [...configuration omitted...]
  libavutil      56. 51.100 / 56. 51.100
  libavcodec     58. 91.100 / 58. 91.100
  libavformat    58. 45.100 / 58. 45.100
  libavdevice    58. 10.100 / 58. 10.100
  libavfilter     7. 85.100 /  7. 85.100
  libavresample   4.  0.  0 /  4.  0.  0
  libswscale      5.  7.100 /  5.  7.100
  libswresample   3.  7.100 /  3.  7.100
  libpostproc    55.  7.100 / 55.  7.100

Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'foo.MOV':
  Metadata:
    major_brand     : qt  
    minor_version   : 0
    compatible_brands: qt  
    creation_time   : [omitted]
    com.apple.quicktime.make: [omitted]
    com.apple.quicktime.model: [omitted]
    com.apple.quicktime.software: [omitted]
    com.apple.quicktime.creationdate: [omitted]
  Duration: 00:00:04.71, start: 0.000000, bitrate: 17579 kb/s
    Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709), 1920x1080, 17492 kb/s, 24 fps, 24 tbr, 600 tbn, 1200 tbc (default)
    Metadata:
      rotate          : 90
      creation_time   : [omitted]
      handler_name    : Core Media Video
      encoder         : H.264
    Side data:
      displaymatrix: rotation of -90.00 degrees
    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, mono, fltp, 63 kb/s (default)
    Metadata:
      creation_time   : [omitted]
      handler_name    : Core Media Audio
    Stream #0:2(und): Data: none (mebx / 0x7862656D), 9 kb/s (default)
    Metadata:
      creation_time   : [omitted]
      handler_name    : Core Media Metadata
    Stream #0:3(und): Data: none (mebx / 0x7862656D), 0 kb/s (default)
    Metadata:
      creation_time   : [omitted]
      handler_name    : Core Media Metadata

Input #1, mov,mp4,m4a,3gp,3g2,mj2, from 'bar.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf58.29.100
  Duration: 00:00:01.94, start: 0.000000, bitrate: 641 kb/s
    Stream #1:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, smpte170m/unknown/smpte170m), 480x360 [SAR 1:1 DAR 4:3], 354 kb/s, 24.58 fps, 24.58 tbr, 113734695.00 tbn, 49.16 tbc (default)
    Metadata:
      handler_name    : VideoHandler
    Stream #1:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 280 kb/s (default)
    Metadata:
      handler_name    : SoundHandler
      
Input #2, mov,mp4,m4a,3gp,3g2,mj2, from 'fiz.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf58.29.100
  Duration: 00:00:01.98, start: 0.000000, bitrate: 725 kb/s
    Stream #2:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, smpte170m/unknown/smpte170m), 480x360 [SAR 1:1 DAR 4:3], 442 kb/s, 24.58 fps, 24.58 tbr, 113734695.00 tbn, 49.16 tbc (default)
    Metadata:
      handler_name    : VideoHandler
    Stream #2:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 278 kb/s (default)
    Metadata:
      handler_name    : SoundHandler