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• I need assistance of making a automated script for ffmpeg [closed]

  18 décembre 2024, par user2614404

  Currently i use this script that GPT generated :

  


  ffmpeg -c:v av1_qsv -b:v 0 -global_quality 20 -preset veryslow -look_ahead 64 -c:a copy -c:s copy G:\1ARC-movies\A-View-to-a-kill.mkv -i Y:\media\Movies\A_VIEW_TO_A_KILL_t05.mkv

  


  But sadly GPT being gpt, it hallucinates answers, and none of it's deeper automation code scripts were working when it made the scripts for a .ps1 script file.

  


  And as i find most of the docs quite overwhelming, i need help to simplify what i need. As i learn best when i get explained what i currently try to do, and not every variable ffmpeg can do.

  


  what i want the script to do is :

  


  1 : convert movies with AV1_QSV with "veryslow", as that's apparently from what i've read up being the best it can do

  


  2 : Global quality as close to 50 as possible (smaller, the better), as 20-6 gave the same range of percentage of 97% VMAF score, 22 gave 95%, so 20 is the largest number i can go, as VMAF via NMKODER reported any higher number was sub 97%.

  


  3 : Give it a main folder for movies and shows to scan, and convert all the media in there to their respective subfolders to a designated output folder.

  


  2 : Automatic crop detection, as some crops it to a 21:9 ratio, others has very small letterboxes. As GPT's code for that attempt for some reason used cpu instead of arc's quicksync.

  


  As this will be ran from powershell, and it's to replace my plex library, by transcoding all movies and shows, starting with the least watched ones/shows that my family has seen, as then those will be unavailable for them until unraid 7 is out of beta to read intel arc for av1.

  


• How to overlay frames before making a gif FFMPEG WEBM TO GIF

  10 février 2021, par AVID_FFMPEG

  I'm using windows batch to do some ffmpeg work

  


  Basically what I need to do is this

  


  Add an overlay every X frames (10 in this example, 1, 11 , 21 and so on) to a webm source to a gif.

  


  The how doesn't really matter as long as I keep the quality of my current palette/filter/dither usage

  


  Solution I found : I made a Video to png, overlay the png with batch for loop and make a gif

  


  Problem I encountered : Gif doesn't work with the overlayed pngs

  


  rem EXTRACTING
ffmpeg !time_range! -i "input.webm" -vsync 0 -vf "fps=20,scale=!size!" "output_%%03d.png" 


  


  the two %% is because you need to escape it in batch so ffmpeg sees "%03d"

  


  REM OVERLAYING
for %%i in (_*1.png) do (
ffmpeg -y -v error -i %%i -i %tmp_blank_frame% -filter_complex "overlay"  overlayed_%%~nxi
del %%i
)
REM REPLACING
rename "overlayed_*" "//////////*"


  


  It is not pretty by any means, but it works... somewhat.

  


  It does it's job of overlaying and renaming proprely, but when I recompile the frames into a gif with

  


  ffmpeg -y -framerate 20 -i "output_%%03d.png" -i "!palette!" -filter_complex "!filters! [v]; [v][1:v] paletteuse=dither=!dither!" "overlayedgif.gif"


  


  it just gives me an error "Error marking filters as finished" and does nothing.

  


  ffmpeg -y -framerate 20 -i "output_%%03d.png" -i "!palette!" "overlayedgif.gif"


  


  It makes the gif without the black frames (skips them) also terrible quality

  


  I am open to any suggestion. Pretty new to this whole ffmpeg and this is starting to be very complicated for me so there might be some code that I overlook or don't fully understand

  


  Important note IF I REMOVE THE OVERLAY/RENAME BLOCK MY SCRIPT WORKS WONDERS !!!

  


  EDIT : edited confusing variables im using in my script

  


• vorbis : Use a local codebook variable

  3 mars 2015, par Luca Barbato

  vorbis : Use a local codebook variable
  Makes the code a little simpler.
  

  • [DH] libavcodec/vorbisdec.c