[FFmpeg-user] Batch extracting frames from multiple videos

[JackDesBwa]

It seems to be Windows batch, so I personally cannot help a lot here, but I
can give some indications.
You probably can (as I usually do to check my own scripts before execution)
replace the ffmpeg command by echo (or equivalent in windows) to check if
the generated command arguments are exactly what you want and correct in
consequence.
Also, notice that fps=2 gives two images per seconds. One image every 2
seconds is fps=0.5

ffmpeg -i countdown.mp4 -vf fps=0.5 countdown-%06d.png works as you would
expect on my Linux machine, so it is probably an error in variable
manipulation in batch script, with which I am not competent to help.

JackDesBwa

Le mar. 17 sept. 2019 à 12:22, Joseph Zaki <joseph at loko.ai> a écrit :

> Hi everyone,
>
> I'm new to ffmpeg and having some issues batching a process. I have several
> dozen videos that I need to extract images every 2 seconds from.
>
> I tried this script: for %%a in ("*.mp4") do ffmpeg -i %%a -vf fps=2
> "%%~na.%%06d.png
>
> But kept getting an error: Output file is empty, nothing was encoded (check
> -ss / -t / -frames parameters if used)
>
> Can anyone point me in the right direction on how to fix this?
>
> Cheers,
> JZ
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