我有一个 .mkv 文件，其中有 2 个音轨和 2 个字幕轨（SRT 格式）。
我想将该 .mkv 转换为 mp4，并让其具有音轨 #2 和子轨道 #2 作为启动 mp4 时播放的轨道。
我正在使用 FFMPEG，因此我使用它来转换：
ffmpeg -i myMovie.mkv -vcodec copy -acodec copy myMovieMP4.mp4
这会导致两个问题：
- 它使用音轨 #1
- 即使选择了字幕轨道，字幕也不会出现
*编辑：ffmpeg -i test.mp4 的结果：
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'test.mp4':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2mp41
encoder : Lavf58.45.100
Duration: 00:22:59.76, start: 0.000000, bitrate: 362 kb/s
Chapter #0:0: start 0.000000, end 90.400000
Metadata:
title : Opening
Chapter #0:1: start 90.400000, end 532.334000
Metadata:
title : Part A
Chapter #0:2: start 532.334000, end 1299.801000
Metadata:
title : Part B
Chapter #0:3: start 1299.801000, end 1359.334000
Metadata:
title : Ending
Chapter #0:4: start 1359.334000, end 1379.754000
Metadata:
title : Next on AAAA
Stream #0:0(und): Video: hevc (Main 10) (hev1 / 0x31766568), yuv420p10le(tv, unknown/bt709/unknown), 720x480 [SAR 1:1 DAR 3:2], 326 kb/s, SAR 8:9 DAR 4:3, 23.98 fps, 23.98 tbr, 16k tbn, 23.98 tbc (default)
Metadata:
handler_name : VideoHandler
Stream #0:1(und): Audio: aac (HE-AAC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 30 kb/s (default)
Metadata:
handler_name : SoundHandler
Stream #0:2(eng): Subtitle: mov_text (tx3g / 0x67337874), 0 kb/s (default)
Metadata:
handler_name : SubtitleHandler
Stream #0:3(eng): Data: bin_data (text / 0x74786574)
Metadata:
handler_name : SubtitleHandler
At least one output file must be specified
*编辑2：
Input #0, matroska,webm, from 'myMovie.mkv':
Metadata:
creation_time : 2016-10-04T14:07:11.000000Z
ENCODER : Lavf56.0.100
Duration: 00:22:59.79, start: 0.000000, bitrate: 388 kb/s
Chapter #0:0: start 0.000000, end 90.400000
Metadata:
title : Opening
Chapter #0:1: start 90.400000, end 532.334000
Metadata:
title : Part A
Chapter #0:2: start 532.334000, end 1299.801000
Metadata:
title : Part B
Chapter #0:3: start 1299.801000, end 1359.334000
Metadata:
title : Ending
Chapter #0:4: start 1359.334000, end 1379.754000
Metadata:
title : Next on AAAA
Stream #0:0: Video: hevc (Main 10), yuv420p10le(tv, unknown/bt709/unknown), 720x480 [SAR 1:1 DAR 3:2], SAR 8:9 DAR 4:3, 23.98 fps, 23.98 tbr, 1k tbn, 23.98 tbc (default)
Metadata:
title : Encoded with IFME v4.9.4.0
BPS : 326855
BPS-eng : 326855
DURATION : 00:22:59.755000000
DURATION-eng : 00:22:59.755000000
NUMBER_OF_FRAMES: 33081
NUMBER_OF_FRAMES-eng: 33081
NUMBER_OF_BYTES : 56372607
NUMBER_OF_BYTES-eng: 56372607
_STATISTICS_WRITING_APP: mkvmerge v9.2.0 ('Photograph') 64bit
_STATISTICS_WRITING_APP-eng: mkvmerge v9.2.0 ('Photograph') 64bit
_STATISTICS_WRITING_DATE_UTC: 2016-10-04 14:07:11
_STATISTICS_WRITING_DATE_UTC-eng: 2016-10-04 14:07:11
_STATISTICS_TAGS: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
_STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
Stream #0:1: Audio: aac (HE-AAC), 48000 Hz, stereo, fltp (default)
Metadata:
title : Track 1
BPS : 29395
BPS-eng : 29395
DURATION : 00:22:59.755000000
DURATION-eng : 00:22:59.755000000
NUMBER_OF_FRAMES: 32338
NUMBER_OF_FRAMES-eng: 32338
NUMBER_OF_BYTES : 5069783
NUMBER_OF_BYTES-eng: 5069783
_STATISTICS_WRITING_APP: mkvmerge v9.2.0 ('Photograph') 64bit
_STATISTICS_WRITING_APP-eng: mkvmerge v9.2.0 ('Photograph') 64bit
_STATISTICS_WRITING_DATE_UTC: 2016-10-04 14:07:11
_STATISTICS_WRITING_DATE_UTC-eng: 2016-10-04 14:07:11
_STATISTICS_TAGS: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
_STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
Stream #0:2: Audio: aac (HE-AAC), 48000 Hz, stereo, fltp
Metadata:
title : Track 2
BPS : 30140
BPS-eng : 30140
DURATION : 00:22:59.755000000
DURATION-eng : 00:22:59.755000000
NUMBER_OF_FRAMES: 32338
NUMBER_OF_FRAMES-eng: 32338
NUMBER_OF_BYTES : 5198254
NUMBER_OF_BYTES-eng: 5198254
_STATISTICS_WRITING_APP: mkvmerge v9.2.0 ('Photograph') 64bit
_STATISTICS_WRITING_APP-eng: mkvmerge v9.2.0 ('Photograph') 64bit
_STATISTICS_WRITING_DATE_UTC: 2016-10-04 14:07:11
_STATISTICS_WRITING_DATE_UTC-eng: 2016-10-04 14:07:11
_STATISTICS_TAGS: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
_STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
Stream #0:3(eng): Subtitle: ass (default)
Metadata:
title : Signs/Songs Sub
LANGUAGE : eng
ENCODER : Lavc56.0.100 ass
BPS : 13
BPS-eng : 13
DURATION : 00:22:38.710000000
DURATION-eng : 00:22:38.710000000
NUMBER_OF_FRAMES: 30
NUMBER_OF_FRAMES-eng: 30
NUMBER_OF_BYTES : 2313
NUMBER_OF_BYTES-eng: 2313
_STATISTICS_WRITING_APP: mkvmerge v9.2.0 ('Photograph') 64bit
_STATISTICS_WRITING_APP-eng: mkvmerge v9.2.0 ('Photograph') 64bit
_STATISTICS_WRITING_DATE_UTC: 2016-10-04 14:07:11
_STATISTICS_WRITING_DATE_UTC-eng: 2016-10-04 14:07:11
_STATISTICS_TAGS: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
_STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
Stream #0:4(eng): Subtitle: ass
Metadata:
title : Full English Sub
LANGUAGE : eng
ENCODER : Lavc56.0.100 ass
BPS : 112
BPS-eng : 112
DURATION : 00:22:53.940000000
DURATION-eng : 00:22:53.940000000
NUMBER_OF_FRAMES: 331
NUMBER_OF_FRAMES-eng: 331
NUMBER_OF_BYTES : 19247
NUMBER_OF_BYTES-eng: 19247
_STATISTICS_WRITING_APP: mkvmerge v9.2.0 ('Photograph') 64bit
_STATISTICS_WRITING_APP-eng: mkvmerge v9.2.0 ('Photograph') 64bit
_STATISTICS_WRITING_DATE_UTC: 2016-10-04 14:07:11
_STATISTICS_WRITING_DATE_UTC-eng: 2016-10-04 14:07:11
_STATISTICS_TAGS: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
_STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
Invalid input file index: 2.
*编辑 3：使用此命令：
ffmpeg -i myMovie.mkv -vcodec copy -acodec copy -map 0:s:1 -map 0:v:0 -map 0:a:1 -c:s mov_text test.mp4
Input #0, matroska,webm, from 'myMovie.mkv':
Metadata:
creation_time : 2016-10-04T14:07:11.000000Z
ENCODER : Lavf56.0.100
Duration: 00:22:59.79, start: 0.000000, bitrate: 388 kb/s
Chapter #0:0: start 0.000000, end 90.400000
Metadata:
title : Opening
Chapter #0:1: start 90.400000, end 532.334000
Metadata:
title : Part A
Chapter #0:2: start 532.334000, end 1299.801000
Metadata:
title : Part B
Chapter #0:3: start 1299.801000, end 1359.334000
Metadata:
title : Ending
Chapter #0:4: start 1359.334000, end 1379.754000
Metadata:
title : Next on AAAA
Stream #0:0: Video: hevc (Main 10), yuv420p10le(tv, unknown/bt709/unknown), 720x480 [SAR 1:1 DAR 3:2], SAR 8:9 DAR 4:3, 23.98 fps, 23.98 tbr, 1k tbn, 23.98 tbc (default)
Metadata:
title : Encoded with IFME v4.9.4.0
BPS : 326855
BPS-eng : 326855
DURATION : 00:22:59.755000000
DURATION-eng : 00:22:59.755000000
NUMBER_OF_FRAMES: 33081
NUMBER_OF_FRAMES-eng: 33081
NUMBER_OF_BYTES : 56372607
NUMBER_OF_BYTES-eng: 56372607
_STATISTICS_WRITING_APP: mkvmerge v9.2.0 ('Photograph') 64bit
_STATISTICS_WRITING_APP-eng: mkvmerge v9.2.0 ('Photograph') 64bit
_STATISTICS_WRITING_DATE_UTC: 2016-10-04 14:07:11
_STATISTICS_WRITING_DATE_UTC-eng: 2016-10-04 14:07:11
_STATISTICS_TAGS: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
_STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
Stream #0:1: Audio: aac (HE-AAC), 48000 Hz, stereo, fltp (default)
Metadata:
title : Track 1
BPS : 29395
BPS-eng : 29395
DURATION : 00:22:59.755000000
DURATION-eng : 00:22:59.755000000
NUMBER_OF_FRAMES: 32338
NUMBER_OF_FRAMES-eng: 32338
NUMBER_OF_BYTES : 5069783
NUMBER_OF_BYTES-eng: 5069783
_STATISTICS_WRITING_APP: mkvmerge v9.2.0 ('Photograph') 64bit
_STATISTICS_WRITING_APP-eng: mkvmerge v9.2.0 ('Photograph') 64bit
_STATISTICS_WRITING_DATE_UTC: 2016-10-04 14:07:11
_STATISTICS_WRITING_DATE_UTC-eng: 2016-10-04 14:07:11
_STATISTICS_TAGS: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
_STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
Stream #0:2: Audio: aac (HE-AAC), 48000 Hz, stereo, fltp
Metadata:
title : Track 2
BPS : 30140
BPS-eng : 30140
DURATION : 00:22:59.755000000
DURATION-eng : 00:22:59.755000000
NUMBER_OF_FRAMES: 32338
NUMBER_OF_FRAMES-eng: 32338
NUMBER_OF_BYTES : 5198254
NUMBER_OF_BYTES-eng: 5198254
_STATISTICS_WRITING_APP: mkvmerge v9.2.0 ('Photograph') 64bit
_STATISTICS_WRITING_APP-eng: mkvmerge v9.2.0 ('Photograph') 64bit
_STATISTICS_WRITING_DATE_UTC: 2016-10-04 14:07:11
_STATISTICS_WRITING_DATE_UTC-eng: 2016-10-04 14:07:11
_STATISTICS_TAGS: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
_STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
Stream #0:3(eng): Subtitle: ass (default)
Metadata:
title : Signs/Songs Sub
LANGUAGE : eng
ENCODER : Lavc56.0.100 ass
BPS : 13
BPS-eng : 13
DURATION : 00:22:38.710000000
DURATION-eng : 00:22:38.710000000
NUMBER_OF_FRAMES: 30
NUMBER_OF_FRAMES-eng: 30
NUMBER_OF_BYTES : 2313
NUMBER_OF_BYTES-eng: 2313
_STATISTICS_WRITING_APP: mkvmerge v9.2.0 ('Photograph') 64bit
_STATISTICS_WRITING_APP-eng: mkvmerge v9.2.0 ('Photograph') 64bit
_STATISTICS_WRITING_DATE_UTC: 2016-10-04 14:07:11
_STATISTICS_WRITING_DATE_UTC-eng: 2016-10-04 14:07:11
_STATISTICS_TAGS: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
_STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
Stream #0:4(eng): Subtitle: ass
Metadata:
title : Full English Sub
LANGUAGE : eng
ENCODER : Lavc56.0.100 ass
BPS : 112
BPS-eng : 112
DURATION : 00:22:53.940000000
DURATION-eng : 00:22:53.940000000
NUMBER_OF_FRAMES: 331
NUMBER_OF_FRAMES-eng: 331
NUMBER_OF_BYTES : 19247
NUMBER_OF_BYTES-eng: 19247
_STATISTICS_WRITING_APP: mkvmerge v9.2.0 ('Photograph') 64bit
_STATISTICS_WRITING_APP-eng: mkvmerge v9.2.0 ('Photograph') 64bit
_STATISTICS_WRITING_DATE_UTC: 2016-10-04 14:07:11
_STATISTICS_WRITING_DATE_UTC-eng: 2016-10-04 14:07:11
_STATISTICS_TAGS: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
_STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
Output #0, mp4, to 'test.mp4':
Metadata:
encoder : Lavf58.45.100
Chapter #0:0: start 0.000000, end 90.400000
Metadata:
title : Opening
Chapter #0:1: start 90.400000, end 532.334000
Metadata:
title : Part A
Chapter #0:2: start 532.334000, end 1299.801000
Metadata:
title : Part B
Chapter #0:3: start 1299.801000, end 1359.334000
Metadata:
title : Ending
Chapter #0:4: start 1359.334000, end 1379.754000
Metadata:
title : Next on AAAA
Stream #0:0(eng): Subtitle: mov_text (tx3g / 0x67337874)
Metadata:
title : Full English Sub
LANGUAGE : eng
_STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
BPS : 112
BPS-eng : 112
DURATION : 00:22:53.940000000
DURATION-eng : 00:22:53.940000000
NUMBER_OF_FRAMES: 331
NUMBER_OF_FRAMES-eng: 331
NUMBER_OF_BYTES : 19247
NUMBER_OF_BYTES-eng: 19247
_STATISTICS_WRITING_APP: mkvmerge v9.2.0 ('Photograph') 64bit
_STATISTICS_WRITING_APP-eng: mkvmerge v9.2.0 ('Photograph') 64bit
_STATISTICS_WRITING_DATE_UTC: 2016-10-04 14:07:11
_STATISTICS_WRITING_DATE_UTC-eng: 2016-10-04 14:07:11
_STATISTICS_TAGS: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
encoder : Lavc58.91.100 mov_text
Stream #0:1: Video: hevc (Main 10) (hev1 / 0x31766568), yuv420p10le(tv, unknown/bt709/unknown), 720x480 [SAR 8:9 DAR 4:3], q=2-31, 23.98 fps, 23.98 tbr, 16k tbn, 1k tbc (default)
Metadata:
title : Encoded with IFME v4.9.4.0
BPS : 326855
BPS-eng : 326855
DURATION : 00:22:59.755000000
DURATION-eng : 00:22:59.755000000
NUMBER_OF_FRAMES: 33081
NUMBER_OF_FRAMES-eng: 33081
NUMBER_OF_BYTES : 56372607
NUMBER_OF_BYTES-eng: 56372607
_STATISTICS_WRITING_APP: mkvmerge v9.2.0 ('Photograph') 64bit
_STATISTICS_WRITING_APP-eng: mkvmerge v9.2.0 ('Photograph') 64bit
_STATISTICS_WRITING_DATE_UTC: 2016-10-04 14:07:11
_STATISTICS_WRITING_DATE_UTC-eng: 2016-10-04 14:07:11
_STATISTICS_TAGS: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
_STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
Stream #0:2: Audio: aac (HE-AAC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp
Metadata:
title : Track 2
BPS : 30140
BPS-eng : 30140
DURATION : 00:22:59.755000000
DURATION-eng : 00:22:59.755000000
NUMBER_OF_FRAMES: 32338
NUMBER_OF_FRAMES-eng: 32338
NUMBER_OF_BYTES : 5198254
NUMBER_OF_BYTES-eng: 5198254
_STATISTICS_WRITING_APP: mkvmerge v9.2.0 ('Photograph') 64bit
_STATISTICS_WRITING_APP-eng: mkvmerge v9.2.0 ('Photograph') 64bit
_STATISTICS_WRITING_DATE_UTC: 2016-10-04 14:07:11
_STATISTICS_WRITING_DATE_UTC-eng: 2016-10-04 14:07:11
_STATISTICS_TAGS: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
_STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
Stream mapping:
Stream #0:4 -> #0:0 (ass (ssa) -> mov_text (native))
Stream #0:0 -> #0:1 (copy)
Stream #0:2 -> #0:2 (copy)
Press [q] to stop, [?] for help
frame=33081 fps=0.0 q=-1.0 Lsize= 61130kB time=00:22:59.74 bitrate= 363.0kbits/s speed=5.91e+03x
video:55051kB audio:5076kB subtitle:14kB other streams:0kB global headers:1kB muxing overhead: 1.644363%
答案1
MKVToolNix可以列出各种流的数量，但只能输出为mkv。
作为可以输出到 mp4 的 ffmpeg 的 GUI，有媒体转换器。
非常容易使用，但是如果带有字幕的话，我必须编辑字幕编解码器并更改为 mov_text。
它可以转换为各种格式，且具有 ffmpeg 的所有功能和限制。