is there any tool/software which joins 3 seconds intro to all 100 videos in batch, i forgot to put into.
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ffmpeg is the answer I would also give.
I just tried this out and it did indeed add the same video to the beginning of every file in the folder:
for %%A IN (*.mpg) DO ffmpeg -i "concat:test.mpg|%%A" -c copy "new_%%A"
To use this, you put a copy of ffmpeg in the folder that holds all your videos. You then copy the line above to Notepad and save it in that same folder with extension ".bat". Make sure the extension is .bat and not .txt.
You then run that batch file (double-click on it in Explorer) to cause ffmpeg to do its thing.
Last edited by johnmeyer; 11th Dec 2018 at 20:32.