When viewing some mkv files you end to find in some cases that the soft subtitles are enabled by default. To disable, follow this
Check the current file info:
mkvinfo <filename>.mkv + EBML head |+ EBML version: 1 |+ EBML read version: 1 |+ EBML maximum ID length: 4 |+ EBML maximum size length: 8 |+ Doc type: matroska |+ Doc type version: 2 |+ Doc type read version: 2 + Segment, size 4687414538 |+ Seek head (subentries will be skipped) |+ Segment tracks | + A track | + Track number: 1 (track ID for mkvmerge & mkvextract: 0) | + Track UID: 1280263319 | + Track type: video | + Forced flag: 1 | + Lacing flag: 0 | + MinCache: 1 | + Codec ID: V_MPEG4/ISO/AVC | + CodecPrivate, length 40 (h.264 profile: High @L4.1) | + Default duration: 41.708ms (23.976 frames/fields per second for a video track) | + Video track | + Pixel width: 1280 | + Pixel height: 688 | + Display width: 1280 | + Display height: 688 | + Interlaced: 0 | + Enabled: 1 | + Default flag: 1 | + Timecode scale: 1 | + Max BlockAddition ID: 0 | + Codec decode all: 1 | + A track | + Track number: 2 (track ID for mkvmerge & mkvextract: 1) | + Track UID: 1577341855 | + Track type: audio | + Forced flag: 1 | + Codec ID: A_DTS | + Audio track | + Sampling frequency: 48000 | + Channels: 2 | + Content encodings | + Content encoding | + Content compression | + Algorithm: 3 (header removal) | + Settings: length 4, data: 0x7f 0xfe 0x80 0x01 | + Order: 0 | + Scope: 1 (1: all frames) | + Type: 0 (compression) | + Enabled: 1 | + Default flag: 1 | + Lacing flag: 1 | + MinCache: 0 | + Timecode scale: 1 | + Max BlockAddition ID: 0 | + Codec decode all: 1 | + A track | + Track number: 3 (track ID for mkvmerge & mkvextract: 2) | + Track UID: 957802682 | + Track type: subtitles | + Forced flag: 1 | + Lacing flag: 0 | + Codec ID: S_TEXT/UTF8 | + Language: rum | + Enabled: 1 | + Default flag: 1 | + MinCache: 0 | + Timecode scale: 1 | + Max BlockAddition ID: 0 | + Codec decode all: 1 |+ EbmlVoid (size: 3734) |+ Segment information | + Timecode scale: 1000000 | + Muxing application: libebml v1.0.0 + libmatroska v1.0.0 | + Writing application: mkvmerge v4.1.1 ('Bouncin' Back') built on Jul 3 2010 22:54:08 | + Duration: 5985.440s (01:39:45.440) | + Date: Tue Feb 8 11:55:23 2011 UTC | + Segment UID: 0xb4 0xc9 0x7c 0x1f 0x34 0xa2 0x1a 0x42 0xae 0x1c 0x29 0x97 0xe3 0x7d 0xc3 0xb3 |+ EbmlVoid (size: 1351) |+ Cluster
So we want to disable, and remove the default flag, as well as the forced one
mkvpropedit <filename>.mkv --edit track:3 --set flag-default=0 mkvpropedit <filename>.mkv --edit track:3 --set flag-forced=0 mkvpropedit <filename>.mkv --edit track:3 --set flag-enabled=0
mkvinfo <filename>.mkv + EBML head |+ EBML version: 1 ... | + A track | + Track number: 3 (track ID for mkvmerge & mkvextract: 2) | + Track UID: 957802682 | + Track type: subtitles | + Forced flag: 0 | + Lacing flag: 0 | + Codec ID: S_TEXT/UTF8 | + Language: rum | + Enabled: 0 | + Default flag: 0
