Thumbnailing failed on some youtube DASH videos #8
Description
When mpv opens DASH and audio streams separately or only the DASH stream, thumbnailing is failed with this message:
$ mpv --ytdl-format=135 https://www.youtube.com/watch?v=oM36vTQOkP0
Playing: https://www.youtube.com/watch?v=oM36vTQOkP0
(+) Video --vid=1 (*) (h264 642x480)
VO: [opengl] 642x480 yuv420p
V: 00:00:00 / 00:19:26 (0%) DS: 2.500/0 Cache: 4s
[mpv_thumbnail_script_client_osc] Creating /dev/shm/DC-1_runtime/cache/mpv_thumbnails/watchvoM36vTQOkP0-0
V: 00:00:00 / 00:19:26 (0%) DS: 2.333/0 Cache: 4s
[mpv_thumbnail_script_server] Thumbnailing command failed!
[mpv_thumbnail_script_server] init
[mpv_thumbnail_script_server]
[mpv_thumbnail_script_server] Debug log: /dev/shm/DC-1_runtime/cache/mpv_thumbnails/watchvoM36vTQOkP0-0/000000.bgra.log
[mpv_thumbnail_script_server] Output file missing! /dev/shm/DC-1_runtime/cache/mpv_thumbnails/watchvoM36vTQOkP0-0/000000.bgra
The log file is completely missing. When using --ytdl-format=18 the thumbnailing is ok.
Not all videos are failing, but I can't see the differences between them. For example this works:
$ mpv --ytdl-format=135 https://www.youtube.com/watch?v=7rG7wPCcxmw
Playing: https://www.youtube.com/watch?v=7rG7wPCcxmw
(+) Video --vid=1 (*) (h264 854x480 25.000fps)
(+) Subs --sid=1 --slang=en 'vtt' (webvtt) (external)
VO: [opengl] 854x480 yuv420p
V: 00:00:00 / 00:11:22 (0%) DS: 2.500/0 Cache: 9s+0KB
[mpv_thumbnail_script_client_osc] Creating /dev/shm/DC-1_runtime/cache/mpv_thumbnails/watchv7rG7wPCcxmw-0
V: 00:00:08 / 00:11:22 (1%) DS: 2.400/1 Cache: 80s+21MB