Concatenation failed. about ffmpeg_batch HOT 13 CLOSED

What settings are you using on the dialog box before confcatenating? (demuxer/video filter, batch concatenation)

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Just the default ones
format: mp4 "-c copy"
"Use concatenation demuxer."
Stream copy is checked.

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No issues found with that. I'd need a few filenames and your output path.

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I have a total of 30 video files. Each one is named in order so like "1", "2", "3" etc without quotation marks. Nothing else in the names. Just the numbers.
The output path is just set to the desktop.

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Unable to reproduce any issue with that settings.

Anyway you may paste your log file here, or some screenshoot.

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Where would I be able to find the log file?

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Main screen button "View last log".

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Oh, pfft how did I miss that? Anyway, here you go.
ffmpeg AVBC.txt

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There maybe some problem with your filenames or paths. Without the full path and name I can't find any problem.
"Shadows" is a filename without extension? or part of a file path?

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All files are in mp4 format. Shadow is a file path name. Should I make a single folder on the desktop, copy all of the videos into there and then try merging them that way?

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Yes, I think that would be a good test.

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Can confirm that that worked. I don't think it liked the spaces or any quotation marks in the file pathname. I am not sure if you could fix that in a later build, but if it is possible, that would be superb.
And if you don't mind me asking while I am still here: what preset/parameters would you recommend to reduce the file size of a video in the program, yet maintain the quality?

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It is a "bug", character "'", though allowed in filename, is used for concatenation settings too. I'll add a warning about it.
Regarding reduze file size, it's a matter of playing with size and quality factor until you find a good trade-off.
For example: -c:v libx264 -crf 25 -vf scale=1280:-1 -c:a aac 96K
If you increase crf value, quality and size decrease. The same with scale size (width).
For example: -c:v libx264 -crf 28 -vf scale=800:-1 -c:a aac 96K

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