But with 100% consistency (in my testing) even on discs previously ripped with a FLAC profile. The only difference (as far as I'm aware) is the different version of MakeMKV. This indicates to me an issue or change with MakeMKV and/or the included version of FFMPEG.
Device Info:
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Drive Information
OS device name: \Device\CdRom2
Current profile: BD-ROM
Manufacturer: HL-DT-ST
Product: BD-RE BP60NB10
Revision: 1.02
Serial number: ...
Firmware date: 2120-05-07 09:35
Bus encryption flags: 17
Highest AACS version: 81
LibreDrive Information
Status: Enabled
Drive platform: MT1959
Firmware type: Patched (microcode access re-enabled)
Firmware version: 1.02
DVD all regions: Yes
BD raw data read: Yes
BD raw metadata read: Yes
Unrestricted read speed: Yes
Disc Information
Label: Black Summoner D1
Timestamp: 2023-06-05 15:02:26
Protection: AACS v68
Data capacity: 46.36 Gb
Disc type: BD-ROM
Number of layers: 2
Channel bit length: 74,5 nm (25.0 GB max. per layer)
Rip Log, this exact disc was previously ripped successfully with the same settings (including filenames) On 2024-09-28 (MakeMKV Version 1.17.7), I went straight from .7 to .9, so I don't have an intermediate comparison:
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Using LibreDrive mode (v06.3 id=4C194CE2C4D1)
Using direct disc access mode
Loaded content hash table, will verify integrity of M2TS files.
Title #00900.mpls has length of 20 seconds which is less than minimum title length of 45 seconds and was therefore skipped
File 00001.mpls was added as title #0
File 00001.mpls(1) was added as title #1
File 00001.mpls(2) was added as title #2
File 00001.mpls(3) was added as title #3
File 00001.mpls(4) was added as title #4
File 00001.mpls(5) was added as title #5
File 00001.mpls(6) was added as title #6
File 00001.mpls(7) was added as title #7
File 00101.mpls was added as title #8
Title #00011.m2ts has length of 0 seconds which is less than minimum title length of 45 seconds and was therefore skipped
Title #00014.m2ts has length of 0 seconds which is less than minimum title length of 45 seconds and was therefore skipped
Title #00015.m2ts has length of 10 seconds which is less than minimum title length of 45 seconds and was therefore skipped
Title #00012.m2ts has length of 7 seconds which is less than minimum title length of 45 seconds and was therefore skipped
Title #00013.m2ts has length of 10 seconds which is less than minimum title length of 45 seconds and was therefore skipped
Title #00050.m2ts has length of 5 seconds which is less than minimum title length of 45 seconds and was therefore skipped
Title #00005.m2ts has length of 0 seconds which is less than minimum title length of 45 seconds and was therefore skipped
Operation successfully completed
Saving 8 titles into directory N:/media/Holding Zone/Black Summoner - Disc One using profile 'FLAC' from file 'C:\Program Files (x86)\MakeMKV/appdata.tar:flac.mmcp.xml'
FFMPEG_ERROR: FFDEC000: [truehd @ 00000250AC91EA80]
FFMPEG_ERROR: FFDEC000: [truehd @ 00000250AC91EA80] channel count mismatch
Failed to save title 0 to file N:/media/Holding Zone/Black Summoner - Disc One/S01E01.mkv
FFMPEG_ERROR: FFDEC000: [truehd @ 00000250AC920880] No restart header present in substream 0.
FFMPEG_ERROR: FFDEC000: [truehd @ 00000250AC920880] channel count mismatch
Failed to save title 1 to file N:/media/Holding Zone/Black Summoner - Disc One/S01E02.mkv
FFMPEG_ERROR: FFDEC000: [truehd @ 00000250AC91E300] No restart header present in substream 0.
FFMPEG_ERROR: FFDEC000: [truehd @ 00000250AC91E300] channel count mismatch
Failed to save title 2 to file N:/media/Holding Zone/Black Summoner - Disc One/S01E03.mkv
FFMPEG_ERROR: FFDEC000: [truehd @ 00000250AC91E6C0] No restart header present in substream 0.
FFMPEG_ERROR: FFDEC000: [truehd @ 00000250AC91E6C0] channel count mismatch
Failed to save title 3 to file N:/media/Holding Zone/Black Summoner - Disc One/S01E04.mkv
FFMPEG_ERROR: FFDEC000: [truehd @ 00000250AC920C40] No restart header present in substream 0.
FFMPEG_ERROR: FFDEC000: [truehd @ 00000250AC920C40] channel count mismatch
Failed to save title 4 to file N:/media/Holding Zone/Black Summoner - Disc One/S01E05.mkv
FFMPEG_ERROR: FFDEC000: [truehd @ 00000250AC91F200] No restart header present in substream 0.
FFMPEG_ERROR: FFDEC000: [truehd @ 00000250AC91F200] channel count mismatch
Failed to save title 5 to file N:/media/Holding Zone/Black Summoner - Disc One/S01E06.mkv
FFMPEG_ERROR: FFDEC000: [truehd @ 00000250AC91D400] No restart header present in substream 0.
FFMPEG_ERROR: FFDEC000: [truehd @ 00000250AC91D400] channel count mismatch
Failed to save title 6 to file N:/media/Holding Zone/Black Summoner - Disc One/S01E07.mkv
FFMPEG_ERROR: FFDEC000: [truehd @ 00000250AC91FD40] No restart header present in substream 0.
FFMPEG_ERROR: FFDEC000: [truehd @ 00000250AC91FD40] channel count mismatch
Failed to save title 7 to file N:/media/Holding Zone/Black Summoner - Disc One/S01E08.mkv
0 titles saved, 8 failed
The workaround in the thread linked at the very top of this post, just using a default profile and then using another program to convert the audio streams to FLAC after the fact, still works fine. But since this behavior is both unexpected and completely consistent in my testing I thought it prudent to raise a bug report.
Leaving the filenames as their default values results in the exact same outcome.