Seeking broken for some Blu-rays in v0.30.0

[wwwamadeus]

mpv version and platform

Commit a9d83ea (or current git master) on Linux

Reproduction steps

mpv --start=10:00 --bluray-device /path/to/bluray/disc bluray://

Expected behavior

Seeks to 10:00.

Actual behavior

The timestamp increases but the audio and video are still that of the beginning of the disc.

Log file

With a9d83ea, chapters were broken but seeking still worked:

[   0.119][v][lavf] queuing seek to 600.000000
[   0.119][v][lavf] execute seek (to 611.650667 flags 32)
[   0.119][v][lavf] seek done
[   0.119][v][cplayer] hr-seek, skipping to 600.000000

Since it has been partially reverted by 1c63869, seeking doesn't work with some discs:

[   0.082][v][demux] Stream is not seekable.
[   0.165][v][disc] queuing seek to 600.000000
[   0.165][v][cplayer] hr-seek, skipping to 600.000000
[   0.165][v][disc] execute seek (to 600.000000 flags 32)
[   0.165][v][disc] seek to: 600.000000
[   0.165][v][lavf] queuing seek to 0.000000
[   0.165][v][lavf] execute seek (to 0.000000 flags 2)
[   0.165][v][lavf] seek done
[   0.165][v][disc] seek done

Sample files

A lot of Blu-Rays are affected (not all) but I'm afraid I can't share one here. It's probably very easy to reproduce.

https://github.com/mpv-player/mpv/wiki/FAQ#Why_is_there_no_DVDBluray_menu_support_And_DVDBD_support_in_general

Feel free to anylyze this and write a patch. If it isn't too intrusive (or, generally, located within the BD/DVD-only code), it will be accepted.

[wwwamadeus]

@wm4 I was aware of mpv dropping menu support but I thought that normal playback was still supported. Especially after you reverted part of the commit dropping some features. I wouldn't report it if it had never worked but I found the culprit by bisecting the code so I thought it was worth sharing. I'm afraid I don't know enough C to fix this myself.

@CounterPillow I have updated the report to follow the template.

Normal playback support was recently "cut down" a bit to remove its influence on the mpv core. Point is, I don't want to maintain the DVD/BD stuff anymore, and I'll raze anything that stands in the way of changes in the core to the ground.

[Dudemanguy]

@wwwamadeus: If possible, could you test #15882? I wasn't able to reproduce the issue you mentioned in the OP on git master so I don't know if it will help you out or not.