Hi again,
So I've had time to digest the inputs I've received so far and have my next
question. Just to recap, I have a decrypted ripped DVD (just the main movie was
extracted, no menus, no compression etc.) into a folder called
"uncompressed.dvdmedia" that contains:
ls -R uncompressed.dvdmedia
AUDIO_TS Info.json VIDEO_TS
uncompressed.dvdmedia/AUDIO_TS:
uncompressed.dvdmedia/VIDEO_TS:
VIDEO_TS.IFO VTS_01_0.IFO VTS_01_1.VOB VTS_01_2.VOB
I converted uncompressed.dvdmedia to an MKV file named "uncompressed.mkv"
using MakeMKV. Here is the relevant English subtitle stream info for that file,
and note that stream also contains embedded tags for the parts that are forced
subtitles:
ffmpeg -i uncompressed.mkv
...
Stream #0:5(eng): Subtitle: dvd_subtitle, 720x480 (default)
Metadata:
BPS-eng : 3503
DURATION-eng : 00:46:28.375077777
NUMBER_OF_FRAMES-eng: 372
NUMBER_OF_BYTES-eng: 1221288
SOURCE_ID-eng : 0120BD
_STATISTICS_WRITING_APP-eng: MakeMKV v1.16.7 darwin(x64-release)
_STATISTICS_WRITING_DATE_UTC-eng: 2022-04-28 03:45:22
_STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
SOURCE_ID
When I do the following command I end up with a movie that displays ONLY the
forced English subtitles by default (which is exactly what I want):
ffmpeg -forced_subs_only 1 \
-i uncompressed.mkv \
-vsync cfr \
-map 0:0 -c:v hevc_videotoolbox -disposition:v default \
-map 0:1 -c:a:0 copy -disposition:a:0 default \
-map 0:5 -c:s:0 copy -disposition:s:0 default \
-default_mode passthrough \
compressed.mkv
However, I don't want to have to first convert my movie to an MKV because that
process is prone to introducing A/V sync issues. I was instructed by Nicolas
George to use dvd2concat and then operate on that output. So here's what I did:
dvd2concat uncompressed.dvdmedia > file.concat
Here's the streams that contains:
ffmpeg -analyzeduration 500M -probesize 500M -safe 0 -f concat
-protocol_whitelist concat,ffconcat,file,subfile -i file.concat
...
Stream #0:0: Video: mpeg2video (Main), yuv420p(tv, progressive), 720x480 [SAR
32:27 DAR 16:9], 29.50 fps, 59.94 tbr, 90k tbn
Side data:
cpb: bitrate max/min/avg: 7600000/0/0 buffer size: 1835008 vbv_delay: N/A
Stream #0:1(en): Audio: ac3, 48000 Hz, 5.1(side), fltp, 448 kb/s
Stream #0:2(fr): Audio: ac3, 48000 Hz, 5.1(side), fltp, 384 kb/s
Stream #0:3(pt): Audio: ac3, 48000 Hz, 5.1(side), fltp, 384 kb/s
Stream #0:4(en): Audio: ac3, 48000 Hz, stereo, fltp, 192 kb/s
Stream #0:5(en): Subtitle: dvd_subtitle, 720x480
Stream #0:6(en): Subtitle: dvd_subtitle, 720x480
Stream #0:7(fr): Subtitle: dvd_subtitle, 720x480
Stream #0:8(pt): Subtitle: dvd_subtitle, 720x480
Stream #0:9(es): Subtitle: dvd_subtitle, 720x480
Stream #0:10(en): Subtitle: dvd_subtitle, 720x480
Stream #0:11(pt): Subtitle: dvd_subtitle, 720x480
Stream #0:12(es): Subtitle: dvd_subtitle, 720x480
I have confirmed stream 0:5 is still the correct English subtitle track, so I
then did:
ffmpeg -analyzeduration 500M -probesize 500M -forced_subs_only 1 \
-safe 0 -f concat -protocol_whitelist concat,ffconcat,file,subfile -i
file.concat \
-vsync cfr \
-map 0:0 -c:v hevc_videotoolbox -disposition:v default \
-map 0:1 -c:a:0 copy -disposition:a:0 default \
-map 0:5 -c:s:0 copy -disposition:s:0 default \
-default_mode passthrough \
compressed.mkv
However, when I play that compressed.mkv movie I see English subtitles for
EVERYTHING and not for only the forced parts i.e. when only a foreign language
is being spoken.
Could somebody please help me doing this last part so that my final subtitle
track only contains the forced subtitles like it does when I start with an MKV
instead. Thanks!
Regards,
Mick
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