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• PowerShell script ffmpeg

  30 mars 2017, par Karma Elite

  Being the good Windows systems admin that I am, I’m finally getting around to learning PowerShell. With that being said, I have no idea what I’m doing (surprise, surprise).

  I thought that it would be a good learning experience for me to play around with PowerShell at home, far away from my production environment. Recently, I’ve begun using FFMPEG to convert all of my .mkv files to .mp4 so I could have better playback support to my PlayStation 3 via Plex, and thought that this would be a good learning experience.

  The command I’ve been running is as follows :

  ffmpeg -i OldVideoName.mkv -vcodec copy -acodec ac3 OldVideoName.mp4

  What I want is have a PowerShell script that will run once, scanning a folder and all sub-folders for .mkv files (Get-ChildItem ".*.mkv"), transcode them to .mp4 via the above command, and place them in the same location as the .mkv with the same naming scheme.

  Example of running the script with D :\Videos as the target directory :

  D :\Videos\home_dvr\movies\video1.mkv —> D :\Videos\home_dvr\video1.mp4
  D :\Videos\home_dvr\tv\video2.mkv —> D :\Videos\home_dvr\tv\video2.mp4

  As you can guess, I can’t figure it out for the life of me. Here’s the latest attempt before giving up.

      $oldvid = Get-ChildItem .\*.mkv -Recurse
  
      $newvid = $oldvid.Name.split(‘.’)[0]; ForEach-Object {
  
              .\ffmpeg.exe -i $oldvid -y -vcodec copy -acodec ac3 $newvid".mp4”
  
      }

  Any help would be appreciated !

• What ffmpeg output format (-f) do I use for two-pass encoding of mkv files

  16 mai 2020, par Mav-Tek

  I recently backed up one of my Blu-ray movies and it is about 36 GB. Using ffmpeg to get info from the video, it is in h.264 in an mkv container. I want to shrink the file size using h.265 compression and targeting a bitrate of 4 Mbits/s so that I can stream it while I am away from my home over my Plex server. My upload speed is limited to 5 Mb/s.

  



  Although I could easily do this with simple software, I want to learn more coding. I have found the proper ffmpeg code two do a two-pass encoding, but in all examples I have found, they use an output format of mp4 but state that "you need to specify an output format (with -f) that matches the output format you will use in pass 2." I assume my "output format" is mkv, but that does not allow my code to run. Can someone explain to me what is meant by output format and what I should be using to encode this from h264 to h265 in a mkv container ?

  



  ffmpeg -y -i input.mkv -c:v libx265 -b:v 4M -x265-params pass=1 -an -f mkv /dev/null && \ ffmpeg -i "Arrival (2016).mkv" -c:v libx265 -b:v 4M -x265-params pass=2 -c:a copy output.mkv 


  



  Also, in order to make this work on my windows PC, I am trying to learn how to edit some of the arguments to allow it to work in Powershell. I believe this is how I would do that :

  



  (ffmpeg -y -i input.mkv -c:v libx265 -b:v 4M -x265-params pass=1 -an -f mkv NUL) -AND (^ ffmpeg -i "Arrival (2016).mkv" -c:v libx265 -b:v 4M -x265-params pass=2 -c:a copy  output.mkv)


  


• Loosing video quality when merging files

  23 juillet 2019, par S.T

  Creating a video from 2 videos (each video is about 15MB, with good quality), merging them side by side is causing loosing the videos quality and creating a movie with the size of 1MB.

  i made a command that takes 2 movies, placing them side by side and merging them to one movie.

  ffmpeg -threads 11 -i 1.mp4 -i 2.mp4 -i logo.png -filter_complex [0:v]pad=width=iw+20:height=ih+20:x=10:y=10:color=black[a];[1:v]pad=width=iw+20:height=ih+20:x=10:y=10:color=black[b];
  
  nullsrc=size=1280x960[base];[a]setpts=PTS-STARTPTS,scale=640x960[left];[b]setpts=PTS-STARTPTS,scale=640x960[right];[base][left]overlay=shortest=1[tmp1];[tmp1][right]overlay=640:0[video];[0:a]apad[apa];[1:a]apad[apa1];[apa][apa1]amix=inputs=2:duration=longest[audio];[2:v]scale=120:44[ovrl];[video][ovrl]overlay=20:45[videoandlogo] -map [videoandlogo] -map [audio] -t 25 output.mp4

  why is the command reduce the quality and creating only a 1MB file ?
  Thanks.