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• how to capture continuous Realtime progress stream of output (from ffmpeg)

  6 décembre 2022, par user206904

  I am having trouble showing the progress of ffmpeg through my script. I compile my script to exe with ps2exe and ffmpeg output on standard error instead of outputting on standard out
So I used to pipe 1 option

  


  my script.ps1 now is :

  


  # $nb_of_frames= #some_int
& $ffmpeg_path -progress pipe:1 -i input.mp4 -c:v libx264 -pix_fmt yuv420p -crf 25 -preset fast -an output.mp4


  


  then I compile it with ps2exe. (to reproduce you don't need the compile, just use the above command with pipe:1 directly in cmd or PowerShell you will get the same behavior)

  


  Normally with ffmpeg you get a progress reporting (that is interactive), one line containing the information and it keeps getting updated as 1 single line without spamming the console with 100s of lines, it looks like this.

  


  frame= 7468 fps=115 q=22.0 size=   40704kB time=00:05:10.91 bitrate=1072.5kbits/s speed= 4.8x


  


  But this does not appear in the compiled version of my script, so after digging I added -progress pipe:1 to get the progress to appear on std out

  


  Now I get a continuous output every second that looks like this :

  


  frame=778
fps=310.36
stream_0_0_q=16.0
bitrate= 855.4kbits/s
total_size=3407872
progress=continue
...
frame=1092
fps=311.04
stream_0_0_q=19.0
bitrate= 699.5kbits/s
total_size=3932160
progress=continue 


  


  I would like to print some sort of updatable percentage out of this, I can compute a percentage easily if I can capture that frame number, but in this case, I don't know how to capture a real-time output like this and how to make my progress reporting update 1 single line of percentage in real-time (or some progress bar via symbols) instead of spamming on many lines

  


  (or if there is a way to make the default progress of FFmpeg appear in the compiled version of my script that would work too)

  


  edit : a suggestion based on the below answer

  


  #use the following lines instead of write-progress if using with ps2exe
            #$a=($frame * 100 / $maxFrames)
            #$str = "#"*$a
            #$str2 = "-"*(100-$a)
            #Write-Host -NoNewLine "`r$a% complete | $str $str2|"



  


  Thanks

  


• ffmpeg - convert background to black ? [closed]

  22 juin 2022, par david furst

  the basic problem
  
convert all pixels in all frames of a source video to black if they have a white value below a certain threshold and output the results as a series of static images with no transparency.

  


  my solution so far
  
i am able to do this with a two-step process :

  


  

  1. convert pixels below the threshold to transparent using ffmpeg's colorkey filtre, outputting a series as PNG.

  


  2. use imagemagick to convert the PNG to JPEG.

  


  


  this approach is very slow. ideally i'd like to do everything in one go, within ffmpeg.

  


  the reason i haven't been able to do that so far is that the resulting transparency isn't discarded (as i'd hoped) when outputting to non-transparent formats like JPG, even if i try to 'discard' the alpha layer beforehand using combinations of split and lutrgb ; the resulting JPEGs still resemble the original images.

  


  my current filter chain :

  


  ffmpeg -hide_banner -y -i input.mp4 -f lavfi -i color=c=white \
    -filter_complex "[0:v]format=gray[src];
        [1][src]scale2ref[white][vid];
        [vid][white]blend=all_mode=multiply:shortest=1,colorkey=black:0.95" %05d.png


  


• Video Overlay not returning to black once video stopped

  24 septembre 2020, par Matt Nelson

  I am combining multiple videos from a webrtc call and aligning the "user-terminal" videos to the left, and the "user-visitor" videos to the right. As the visitor feed can start and strop, they have multiple videos so I'm offsetting them by the timestamp.

  


  This is working, however crazy it looks !

  


  The one last issue I have is that when the first visitor video stop on the right, it shows the last frame of that video until the next video starts on the left. Can I have it return o the black background ?

  


  Here is the command passed to ffmpeg :

  


  ffmpeg -y 
-i /recordings/process/5f6c9c3/videoroom-5f6c9c3-user-terminal-1600953586531366-audio.mjr.opus 
-i /recordings/process/5f6c9c3/videoroom-5f6c9c3-user-visitor-1600953592694430-audio.mjr.opus 
-i /recordings/process/5f6c9c3/videoroom-5f6c9c3-user-visitor-1600953609873223-audio.mjr.opus 
-i /recordings/process/5f6c9c3/videoroom-5f6c9c3-user-visitor-1600953628668227-audio.mjr.opus 
-i /recordings/process/5f6c9c3/videoroom-5f6c9c3-user-visitor-1600953663905342-audio.mjr.opus 
-i /recordings/process/5f6c9c3/videoroom-5f6c9c3-user-MasterTerminal-52350116-1600953681107272-audio.mjr.opus 
-i /recordings/process/5f6c9c3/videoroom-5f6c9c3-user-visitor-1600953697832165-audio.mjr.opus 
-i /recordings/process/5f6c9c3/videoroom-5f6c9c3-user-MasterTerminal-52350116-1600953723320364-audio.mjr.opus 
-i /recordings/process/5f6c9c3/videoroom-5f6c9c3-user-visitor-1600953725307043-audio.mjr.opus 
-filter_complex [1:a]adelay=6163|6163[1adelay];[2:a]adelay=23341|23341[2adelay];[3:a]adelay=42136|42136[3adelay];[4:a]adelay=77373|77373[4adelay];[5:a]adelay=94575|94575[5adelay];[6:a]adelay=111300|111300[6adelay];[7:a]adelay=136788|136788[7adelay];[8:a]adelay=138775|138775[8adelay];[0:a][1adelay][2adelay][3adelay][4adelay][5adelay][6adelay][7adelay][8adelay]amix=inputs=9:duration=longest[a] 
-map [a] -ac -2 /recordings/process/5f6c9c3/5f6c9c3.mp3