I wish to apply and ffmpeg filter to many clips

[DeJay]

I am using Linux (Mint 22 Xfce if it makes any difference).

I am new to ffmpeg and want to apply a LUT to a folder full of clips. I am using a script which I managed to modify for my requirements: ffmpeg -i "Input.mp4" -vf lut3d=D-Log_M_to_Rec.709-V1.cube -c:v libx264 -pix_ fmt yuv420p10 -b:v 120M "output.mp4"rec709.mp4 which works perfectly on a clip-by-clip basis. I've spent a couple of days on this and still can't get it to work.

I also tried this copied straight from JV Raines post, not because I want to delogo anything, just to see if it would run. It didn't start. Did I miss something?
for filename in *.avi; do
ffmpeg -i "$filename" -vf delogo=x=160:y=560:w=319:h=79 -c:v libx264 -crf 24 -c:a copy -preset ultrafast "$(basename "$filename" .avi)_delogo.avi" done

Please put me straight.

[ProWo]

This could be done with clever FFmpeg-GUI, but Windows only.
Do you have a windows vm with framework 4.8 installed on your linux distro?
So you could use it.
If you can go this way, I'll give you more info.

[DeJay]

Thanks, but no.

[babiulep]

You forgot a ";" after 'avi"' elogo.avi" done (so inbetween " and done)

[_Al_]

You can always use python, which most likely you have already installed,
save that text into "my_python_file.py", put it in directory with your video files, navigate into directory, right click and open terminal, then type: python3 my_python_file.py

#!/usr/bin/python3
from pathlib import Path
import subprocess
import shlex

# this will get video paths from current directory
DIRECTORY = Path.cwd()

def process(cmd):
    print('processing:', cmd)
    cmd = shlex.split(cmd)
    p = subprocess.Popen(cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE, universal_newlines=True)
    out, err = p.communicate()
    if p.returncode:
        #print ffmpeg log if there was an error
        print(err)    

def to_rec709(video_path, output_path):
    video_path = Path(video_path).as_posix()
    output_path = Path(output_path).as_posix()
    cmd = f'ffmpeg -y -i "{video_path}" -vf lut3d=D-Log_M_to_Rec.709-V1.cube '\
          f'-c:v libx264 -pix_fmt yuv420p10 -b:v 120M "{output_path}"'
    process(cmd)

#create a list of video paths
video_paths = [video_path for video_path in DIRECTORY.glob("*.mp4")]
if not video_paths:
    print("no video paths found")

#create new directory if it does not exist (within directory where files are)
new_directory = DIRECTORY / "rec709"
new_directory.mkdir(parents=True, exist_ok=True)

for video_path in video_paths:
    output_path = new_directory / video_path.name
    to_rec709(video_path, output_path)

Make sure that opened terminal directory is that python file directory (with your video files).

If you want to always edit that python file and its directory for videopaths. Change DIRECTORY variable. But then you perhaps need that *.cube in the same directory as python file. Not sure now.

[babiulep]

If you put it on separate lines no ";" is not needed...
Introduce an extra variable holding the basename of the *.avi
Always use {} i.e: ${NAME}_delogo works but $NAME_delogo does not: that variable ("NAME_delogo") does not exist.
Hope this helps...

for filename in *.avi
do
  NAME=$(basename "${filename}" .avi)
  ffmpeg -i "${filename}" -vf delogo=x=160:y=560:w=319:h=79 -c:v libx264 -crf 24 -c:a copy -preset ultrafast "${NAME}_delogo.avi"
done

[betwixt]

I think you are trying a Bash script without telling it to run Bash.
Try something like this:

#!/bin/bash
FILES="/path to your input files/*"
for f in $FILES
do
ffmpeg -i "$filename" -vf delogo=x=160:y=560:w=319:h=79 -c:v libx264 -crf 24 -c:a copy -preset ultrafast "$filename_done"
done

put it in a script "myvideo.sh" as plain text, save it, make it executable then run it with ./myvideo.sh

Brian.

[_Al_]

If making bash file an executable, careful, that cube file perhaps need to have whole path included as well or be in that executable directory, ..., but for this, you'd need something: for filename in $(find /home/user/my_videos -type f -name "*.mp4"); do ... As was suggested above, providing files with path to iterate from. Or just first simple idea from babiulep:

for filename in *.mp4
do
  NAME=$(basename "${filename}" .mp4)
  ffmpeg -i "${filename}" -vf lut3d=D-Log_M_to_Rec.709-V1.cube -c:v libx264 -pix_fmt yuv420p10 -b:v 120M "${NAME}_to709.mp4"
done

You can run it as: bash whatever.sh if not executable

[DeJay]

Thank you all, with a bit of patience and quite a bit of time, I managed to take your suggestions, do a bit of modification and achieve the object. But Al, that python script frightened the hell out of me!