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• PowerShell and = inside a & call parameter

  18 mars 2018, par Tupsi

  I am trying to run the following inside a powershell script :

  ffmpeg.exe -hide_banner -i .\input.mkv -passlogfile input -c:v libvpx-vp9 -b:v 0 -crf 31 -tile-columns 6 -tile-rows 2 -threads 8 -pass 2 -speed 1 -frame-parallel 1 -row-mt 1 -c:a libopus -b:a 256000 -c:s copy -af aformat=channel_layouts=5.1 -auto-alt-ref 1 -lag-in-frames 25 -y output.mkv

  This works fine on either cmd or powershell line directly, but not if I try to run it inside a .ps1 with &. I get the following error :

  Unrecognized option '-hide_banner -i .\input.mkv -passlogfile input -c:v libvpx-vp9 -b:v 0 -crf 31 -tile-columns 6 -tile-rows 2 -threads 8 -pass 2 -speed 1 -frame-parallel 1 -row-mt 1 -c:a libopus -b:a 256000 -c:s copy -auto-alt-ref 1 -lag-in-frames 25 -y -af aformat=channel_layouts=5.1 output.mkv'. Error splitting the argument list: Option not found

  Digging around a bit it seems that the double = with the -af afilter=channel_layouts=5.1 is pissing powershell off and I have no clue how to get around it. Already tried escaping it in some ways with no luck.

  Is there any way I can pass these kind of arguments to my exe without powershell complaining to be unable to split up the arguments ? Don’t understand the shell tries it in the first place anyway as it should all go to my ffmpeg.exe in the first place.

• How to solve video is choppy when scrolling on android browser ?

  18 septembre 2024, par SiLeafClover

  I am currently doing video scrolly kind of things. I'm using GSAP and Scrolltrigger and sveltekit to play video on scroll. At the beginning of the implementation, the video is very laggy on scroll on all browsers and cross devices.

  


  So I do some research and found out video encoding is so important and found this ffmpeg command through codepen. ffmpeg -i originalVideo.mp4 -movflags faststart -vcodec libx264 -crf 23 -g 1 -pix_fmt yuv420p output.mp4
  
When I use the video which is exported by the above command, it works smoothly on windows, mac and ios. But I'm still having issues with my phone (Andriod). When I check the website on my phone(Android), the video is laggy/choppy on scroll but on ios, the video is fine. So may I know which options do I need to add for the video encoding to play the video smoothly on Android ?

  


• pexpect.run() terminates before ending ffmpeg without finishing the conversion

  24 novembre 2012, par Davisein

  I'm working on a python script that does a custom conversion of videos via ffmpeg.

  My problem is that the execution of ffmpeg stops suddenly after a bit of conversion (usually 3-4 mb out of 100mb) with a None exit code.

  I'm using the pexpect library. Currently I do not check the progress but I will in a close future. It seems that I am right using pexpect regarding these questions FFMPEG and Pythons subprocess and Getting realtime output from ffmpeg to be used in progress bar (PyQt4, stdout). This is the command that I'm running (I have checked that it's exactly this one)

  nice ffmpeg -i '/full/path' -s 640x360 -strict experimental -vcodec libx264
  
     -f mp4 -  coder 0 -bf 0 -refs 1 -flags2 -wpred-dct8x8 -level 30 -crf 26
  
     -bufsize 4000k -maxrate 350k -preset medium -acodec libvo_aacenc
  
     -ar 48000.0 -ab 128K -threads 2 -y '/full/path/out'

  I am using nice but I have tried also without it and the result ends up being the same.

  I'm running pexpect this way :

  output, exit = pexpect.run(self.command(), withexitstatus=True,\
  
                                     logfile=logfile)
  
  print output
  
  print exit

  Of course I have tried the same command on the command line and it works fine.

  Any clue on what might be happening ?