CODEWITHSUNDEEP
ffmpegconcatenation
Jimmy Bungalo
Jimmy Bungalo

Reputation: 1

Concatenation not working in ffmpeg for unknown reason

i'm trying to concatenate 2 videos in ffmpeg, using ffmpeg -y -f concat -safe 0 -i /path/to/mylist.txt -c:v libvpx-vp9 -c:a libopus output.webm, in which mylist.txt is

file /path/to/file.mp4
file /path/to/file.mkv

and the output is

[concat @ 0x7b53638000] Line 1: unknown keyword 'file' /path/to/mylist.txt: Invalid data found when processing input

i also tried using "concat:file.mp4|file.mkv" but it just replicated file.mp4 my question is, what is the problem here? the method i used is verified on ffmpeg's website

Upvotes: 0

Views: 1200

Answers (1)

llogan
llogan

Reputation: 134173

There is an invisible character called a Byte Order Mark (BOM) that is causing the error. Some text editors add a BOM: notably Windows Notepad and the Plain text (.txt) output from Google Docs.

A text file with a BOM is not currently supported by the concat demuxer in FFmpeg. One developer considers it to be "broken Microsoft bullshit": #3718: ffmpeg does not correctly read input text file.

Solution is to use a better text editor or remove the BOM before providing the text file to ffmpeg. Some Linux related examples can be seen in How can I remove the BOM from a UTF-8 file?

Upvotes: 1

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