Support for stupidly long file paths/names.

[gcs8]

Important Information

Provide following Information:

• mpv version > mpv 0.33.0
• Windows Version > 10.0.19043 N/A Build 19043
• Source of the mpv binary >
• If known which version of mpv introduced the problem > all?
• Possible screenshot or video of visual glitches > n/a

Reproduction steps

Have mpv set as the default application for .mkv files.
Double-click on SuperLongFileName.mkv that is at least 205 total characters in length including the file extension.
Watch the video file until you get where you want to take a screenshot then pause the video with the spacebar.
Push the s key.
Receive the on-screen error message of "Error writing screenshot!".
Cry.

Expected behavior

With the Below screenshot options, it should use the extended-length path limit of 32,767 characters.

screenshot-directory="\?\T:\Screen Caps"
screenshot-template=vlcsnap-%f-TimeStamp-%P-Date-%ty-%tm-%td-%tHh%tMm%tSs

Actual behavior

I get "Error writing screenshot!" and my butt becomes hurt. I am assuming that it is running into the default legacy Win32 APIs only support up to 260 characters sanity check somewhere, guessing for windows 7/8/8.1 support.

I have validated that this does work with the above config if the file name is only 105 total characters in length including the file extension.

Log file

cplayer: Using zimg.
reload: demuxer_cache.transition fetch_to_stale {"in_state_time" = 0, "name" = "stale", "demuxer_cache_time" = 121.74209977}
cplayer: Error opening '\?\T:\Screen Caps/SuperLongFileName.mkv-TimeStamp-00_00_04.713-Date-23-04-05-18h15m46s.png' for writing!
cplayer: Error writing screenshot!
statusline: (Paused) AV: 00:00:04 / 00:23:45 (0%) A-V: 0.000025 Vb: 5.313 mbps Ab: 128 kbps

Sample files

Any mkv file name with 205 total characters in length or more including the file extension.

[Dudemanguy]

#10052 might help with this maybe?

[gcs8]

@Dudemanguy That is A solution, however, my autism would appreciate being able to keep the full file name.

I also have a similar issue I need to figure out with opening and making a playlist of files with stupid long names, the current behavior is you have to open the specific long file name and it auto-adds the shorter file names but skips the long ones.

So, overall, would like stupid long file name support.

[cloud11665]

I mean, why not. It doesn't look like a complex change. I can look into that for screenshots, as I'm not yet familiar with the playlist handling code.

[cloud11665]

oh also, the long path prefix is \\?\, as described here. Another way would be to make mpv longPathAware on windows, so that it'd be up to the user and their registry settings.

[Dudemanguy]

I think we support long paths on windows now, but I don't believe screenshot filenames can have long paths. So this is about half solved.