How to fix garbage in mp.command_native stdout

[Rabcor]

I'm using this command to get the subtitle format:

local subformat=mp.command_native({ name = "subprocess", capture_stdout = true, args = { "ffprobe", "-loglevel", "error", "-select_streams", "s:0", "-show_entries", "stream=codec_name", "-of", "csv=p=0", file} })
subformat = subformat.stdout

And it works, if I print it it says "hdmv_pgs_subtitle"

I have another variable:

local bitmapsub = "hdmv_pgs_subtitle"

They should in this case be identical.

So if I use

if string.find(bitmapsub, subformat) then

The condition should be true, however it isn't. It always fails.

If I flip it however and do

if string.find(subformat,bitmapsub) then

Then the condition is true. But I don't want to do it this way (e.g. I want to know if the subtitle format of the file is in bitmap format, so it should be comparing itself to a list of bitmap formats, rather than comparing the list to the file's subtitle format)

This tells me there must be some invisible garbage characters in subformat.stdout

How could I sanitize the string? I tried a bunch of things like substituting %z but I couldn't figure out a solution since I don't know what characters i'm actually dealing with.

[Argon-]

Well, without having tested it, I would totally expect there to be a \n at the end of subformat, courtesy of ffprobe printing one to stdout. If so, that should be trivial to remove.

[Rabcor]

That was it, thanks!