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• FFmpeg - How to choose video stream based on resolution

  23 septembre 2023, par Sylven

  I want to choose the video stream based on it's quality, let's say I want to choose one video stream with certain resolution.

  


  Manually selecting the video stream is not good enough for me because I want to process many files in bulk and they have the video streams in different order, so always going for certain position would make me end up with different resolutions.

  


  I don't want to use filters as that would make me reencode which I don't need and would make it way slower.

  


  I've tried using the -map with metadata but the only key that is different is "variant_bitrate" which has slightly different values everytime, so unless I can use some wildcard or conditionals, I guess it won't work either.

  


  What I want to try now is to obtain the exact bitrate of the stream using ffmpeg or ffprobe and then pass it to the ffmpeg command so it ends in something like this :

  


  ffmpeg -i <url> -map m:variant_bitrate:1760000 ...</url>

  


  PD : I've been reading the FFmpeg documentation and browsing the whole internet without luck.

  


  Edit :
I managed to make it work by first using ffprobe to obtain stream info in json format (easier to parse), then I search for the string "height": 540 and extract next 50 lines (counted them manually so I'm sure I'll pick the value I need), then I search for the string variant_bitrate and then I use a regular expression to extract the bitrate. Once I have the bitrate I make use of the MacOS clipboard (with pbcopy and pbpaste) to pass the value to the final ffmpeg command through the -map option using a metadata selector.

  


  ffprobe -v error -show_streams -of json "https://streamlink.com/master.m3u8?f=dash"
| grep -A 50 '"height": 540' 
| grep variant_bitrate
| grep -oe '\([0-9.]*\)' 
| pbcopy
&& ffmpeg -protocol_whitelist file,http,https,tcp,tls,crypto -i "https://streamlink.com/master.m3u8?f=dash" -map "0:a:0" -map "m:variant_bitrate:$(pbpaste)" -c copy "Output.mp4"


  


  (added line breaks for readability)

  


  I know it looks kinda dirty but I didn't find any other way to achieve my requirement.

  


• PowerShell progress bar won't display

  23 juillet 2014, par Brett

  I’m trying to write my first PowerShell GUI. Basically I’m trying to run a ffmpeg command which is fine and works, but I cannot get the progress bar to run. (I’m brand new to this.) Here is my attempt.

  cd C:\Users\brett\Documents\convert
  
  $cmd = 'ffmpeg.exe'
  
  $arg0 = '-i'
  
  $arg1 = 'MASH_01.ts'
  
  $arg2 = '-c:v'
  
  $arg3 = '-c:a'
  
  $arg4 = 'MASH_01.mp4'
  
  $cf = 'copy'
  
  $isFile = 'MASH_01.mp4'
  
  if (-not(Test-Path -Path $isFile) -eq $false) {
  
    echo "Shit Go"
  
    del $isFile
  
  
  
        & $cmd $arg0 $arg1 $arg2 $cf $arg3 $cf $arg4
  
      for ($i = 1; $i -le 100; $i++) {
  
      Start-Sleep -m 100
  
      Write-Progress -Activity 'Progress Of The Coversion' -Status "$i Percent Complete" -PercentComplete $i;
  
      }
  
  } else {
  
  & $cmd $arg0 $arg1 $arg2 $cf $arg3 $cf $arg4
  
      for ($i = 1; $i -le 100; $i++) {
  
      Start-Sleep -m 100
  
      Write-Progress -Activity 'Progress Of The Coversion' -Status "$i Percent Complete" -PercentComplete $i;
  
      }
  
  }

  Update : There is no error output I can see, but the progress bar runs after the file has been processed, not during.

  here is my latest attempt.. but now i get ffmpeg saying "m" is not a valid switch

  cd C:\Users\brett\Documents\convert
  
  $oldVideo = Get-ChildItem -Include @("*.ts")
  
  Write-Host -ForegroundColor Green -Object $ArgumentList;
  
  # Pause the script until user hits enter
  
  $isFile = 'MASH_01.mp4'
  
  if( -not(Test-Path -Path $isFile) -eq $false) {
  
    echo "Shit Go"
  
    del $isFile
  
    }a
  
    $tool = ffmpeg.exe
  
  $ArgumentList = '`-i'+' '+'MASH_01.ts'+' '+'-c:v'+' '+'copy'+' '+'-c:a'+' '+'copy'+' '+'MASH_01.mp4';
  
  Invoke-Expression $tool $ArgumentList
  
  for($i = 1; $i -le 100; $i++){
  
      ffmpeg $ArgumentList -m 100
  
  
  
      Write-Progress -Activity 'Progress Of The Coversion' -Status "$i Percent Complete" -PercentComplete $i 
  
     `-SecondsRemaining $a -CurrentOperation
  
     "$i% complete" `
  
  
  
      }

• PowerShell progress bar won't display

  28 mai 2021, par Brett

  I'm trying to write my first PowerShell GUI. Basically I'm trying to run a ffmpeg command which is fine and works, but I cannot get the progress bar to run. (I'm brand new to this.) Here is my attempt.

  



  cd C:\Users\brett\Documents\convert
$cmd = 'ffmpeg.exe'
$arg0 = '-i'
$arg1 = 'MASH_01.ts'
$arg2 = '-c:v'
$arg3 = '-c:a'
$arg4 = 'MASH_01.mp4'
$cf = 'copy'
$isFile = 'MASH_01.mp4'
if (-not(Test-Path -Path $isFile) -eq $false) {
  echo "Shit Go"
  del $isFile

      & $cmd $arg0 $arg1 $arg2 $cf $arg3 $cf $arg4
    for ($i = 1; $i -le 100; $i++) {
    Start-Sleep -m 100
    Write-Progress -Activity 'Progress Of The Coversion' -Status "$i Percent Complete" -PercentComplete $i;
    }
} else {
& $cmd $arg0 $arg1 $arg2 $cf $arg3 $cf $arg4
    for ($i = 1; $i -le 100; $i++) {
    Start-Sleep -m 100
    Write-Progress -Activity 'Progress Of The Coversion' -Status "$i Percent Complete" -PercentComplete $i;
    }
}


  



  Update : There is no error output I can see, but the progress bar runs after the file has been processed, not during.

  



  here is my latest attempt.. but now i get ffmpeg saying "m" is not a valid switch

  



  cd C:\Users\brett\Documents\convert
$oldVideo = Get-ChildItem -Include @("*.ts")
Write-Host -ForegroundColor Green -Object $ArgumentList;
# Pause the script until user hits enter
$isFile = 'MASH_01.mp4'
if( -not(Test-Path -Path $isFile) -eq $false) {
  echo "Shit Go"
  del $isFile
  }a
  $tool = ffmpeg.exe
$ArgumentList = '`-i'+' '+'MASH_01.ts'+' '+'-c:v'+' '+'copy'+' '+'-c:a'+' '+'copy'+' '+'MASH_01.mp4';
Invoke-Expression $tool $ArgumentList
for($i = 1; $i -le 100; $i++){
    ffmpeg $ArgumentList -m 100

    Write-Progress -Activity 'Progress Of The Coversion' -Status "$i Percent Complete" -PercentComplete $i 
   `-SecondsRemaining $a -CurrentOperation
   "$i% complete" `

    }