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• How to add this line to FFMPEG batch command ? [closed]

  10 décembre 2020, par user7959439

  I inherited a batch command that takes every png file inside the folder (with the .exe and the command inside) and converts it into a webp file.

  


  for /r %%F in (*.png) do (
    ffmpeg.exe -y -i "%%F" -compression_level 6 "%%~dpnF.webp"
    if not errorlevel 1 if exist "%%~dpnF.webp" del /q "%%F"
)


  


  I want to add a line that at the same time checks for any mp4 files and converts them to gifs.

  


  This is the line

  


  ffmpeg -i input.mp4 -vf "fps=10,scale=320:-1:flags=lanczos,split[s0][s1];[s0]palettegen[p];[s1][p]paletteuse" -loop 0 output.gif


  


  I tried something like but it doesn't work.

  


  for /r %%F in (*.png) do (
    ffmpeg.exe -y -i "%%F" -compression_level 6 "%%~dpnF.webp"
    if not errorlevel 1 if exist "%%~dpnF.webp" del /q "%%F"
)


for /r %%F in (*.mp4) do (
    ffmpeg.exe -y -vf "fps=10,scale=320:-1:flags=lanczos,split[s0][s1];[s0]palettegen[p];[s1][p]paletteuse" -loop 0 "%%~dpnF.gif"
    if not errorlevel 1 if exist "%%~dpnF.mp4" del /q "%%F"
)


  


• FFMPEG works in command line but not in exec(), it returns 127

  26 février 2015, par Felipe Schenone

  The command is

  ffmpeg -i path/to/video.avi path/to/video.mpg

  and it works fine from the command line. However, when I call it with PHPs exec(), the return value is 127, it doesn’t seem to detect FFMPEG. What am I doing wrong ? I’m in localhost and the safe mode is off, but I’m new to both FFMPEG and exec(), so it may be a noob mistake. Thanks in advance.

• In ffmpeg command-line, how to show all filter settings and their parameters before encoding ?

  7 décembre 2023, par F.X.

  Is there a way to force the ffmpeg command-line to display a comprehensive list of all filters and their parameters, even those that are applied automatically like -vf scale ?

  


  (EDIT : To clarify, I do not mean filter documentation, but rather displaying filters that are instantiated at runtime for a particular command-line, just before transcoding starts. The goal of this is mostly checking that ffmpeg is indeed doing the right thing and not inserting/changing filters when I do not intend it to.)

  


  There are a few options available, but none are comprehensive enough. For example :

  


  

  • The lavfi module has a dumpgraph option (here) but only if you're using lavfi.

  


  • The -sws_flags print_info option (here) can be used to determine if -vf scale is applied automatically and shows a subset of its parameters, but not all of them.

  


  


  Additionally, this question appears related the answer doesn't answer what I'm looking for.

  


  Are there better ways to achieve that ?