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There's a video I need to view, foreign language film. I was checking it with ffmpeg, and it seemed legitimate except the third stream was something I've never seen before. I want to know what it is and how to view the stream's contents.

I tried dumping it with

ffmpeg -dump_attachment:t:0 subs.txt -i input.mp4

Yet the file that was dumped is invisible...but showed up a number in the file folder. I'm using windows 8.1 and hidden folders/files are set to visible. Maybe my command is wrong and this is a subfile... instead of a information file..(i tried s:0 instead but no difference)? Or I can't dump this? Should I change from .txt to some other extension or what do I need to do to dump and view it?

I just don't know what it is, and i want to know what it is. If we assume it's a subfile, I should be able to open it in a text editor right? So how can I do that...preferably a safe way of doing so.

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The 3rd stream in your input is a regular stream. Attachments are basically extradata attached to streams.

You would use

ffmpeg -i input.mp4 -map 0:2 -c copy -f data subs.txt
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  • That created a blank .txt file. I can't get any subtitles to showup in vlc player either, it recognizes the stream tho, so maybe its supposed to be a blank file. What does the "-f data" do? I thought -f had something to do with generating raw data, not sure what "data" does though.
    – kite
    Dec 3, 2019 at 0:38
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    data muxer is for any data (binary/text) to be dumped while avoiding all automatic processing that ffmpeg may perform for streams identified as a video or audio type.
    – Gyan
    Dec 3, 2019 at 4:55

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