[Cin] Adding soft subtitles to a DVD video

Andrew Randrianasulu randrianasulu at gmail.com
Mon Feb 12 00:07:21 CET 2024 

пн, 12 февр. 2024 г., 02:02 Terje J. Hanssen <terjejhanssen at gmail.com>:

>
>
> Den 11.02.2024 04:36, skrev Terje J. Hanssen:
>
>
>
> Den 11.02.2024 00:57, skrev Andrew Randrianasulu:
>
>
>
> сб, 10 февр. 2024 г., 21:10 Terje J. Hanssen via Cin <
> cin at lists.cinelerra-gg.org>:
>
>> There are two things I want to add to my current intermediate DVD mpg
>> video files created with ffmpeg, and/or to the DVD tree structure created
>> with DeVeDeNG:
>>
>> 1. Create and add a Navigation menu in the beginning
>> This will be an upcoming, separate topic
>>
>> 2. Create and add Soft Subtitles as simple text info commentaries to the
>> video content
>> This is the topic for this post.
>>
>>
>> The reason that I want *Soft* Subtitles as a separate text file stream
>> related to timing, is because this should be possible to *add* or import
>> to an existing video file  without the need to re-encode. It should also be
>> flexible to display on or off during playback, if I have understood this
>> correct so far.
>>
>
>
> IIRC you can't add text-based subtitles to DVD video. Blu-ray yes, dvd no
> (both can use palletized reduced-color graphical subtitles) ... so at least
> rendering text as palletized picture and then muxing it into mpeg stream is
> unavoidable step,as far as I understand.
>
>
> I have prepared a new video file and will try to add sub-titles to-morrow
>
> http://www.g-raffa.eu/Cinelerra/HOWTO/subtitles.html#_how_to_create_soft_subtitles
>
>
>
> There are written several articles and answers to forum topics about
> adding soft subtitles to video.
> My best but only partly working attempt so far, is by applying this
> solution on StackOverflow:
>
>
>
>
> *Use ffmpeg to add text subtitles: NOTE: This solution adds the subtitles
> to the video as a separate optional (and user-controlled) subtitle track.
> https://stackoverflow.com/questions/8672809/use-ffmpeg-to-add-text-subtitles
> <https://stackoverflow.com/questions/8672809/use-ffmpeg-to-add-text-subtitles>
> *1) First I created a DVD-video compliant MPG file with pcm audio from DV
> source (as previously)
>
> ffmpeg -hide_banner -i DV09-1993.dv -f dvd -target pal-dvd -aspect 4:3
> -b:v 8M -maxrate 8M -minrate 8M -bufsize 20M -muxrate 20M -mbd rd -trellis
> 1 -cmp 0 -subcmp 2 -c:a pcm_dvd DV09-1993.mpg
>
>
> 2) Created the attached srt subtitle file:
>
> DVD-09-1993_subtitle.srt
>
>
>
> 3) Added (muxed) the soft, external subtitle file (2) as a separate track
> to the mpg video file (1)
>
> ffmpeg -hide_banner -i DV09-1993.mpg -i DVD-09-1993_subtitle.srt -c:v copy
> -c:a copy -c:s copy DV09-1993+srt.mpg
>
> [mpeg @ 0x55aac13139c0] start time for stream 0 is not set in
> estimate_timings_from_pts
> Input #0, mpeg, from 'DV09-1993.mpg':
>   Duration: 00:28:04.44, start: 0.540000, bitrate: 9701 kb/s
>   Stream #0:0[0x1bf]: Data: dvd_nav_packet
>   Stream #0:1[0x1e0]: Video: mpeg2video (Main), yuv420p(tv, progressive),
> 720x576 [SAR 16:15 DAR 4:3], 25 fps, 25 tbr, 90k tbn
>     Side data:
>       cpb: bitrate max/min/avg: 9000000/0/0 buffer size: 1835008
> vbv_delay: N/A
>   Stream #0:2[0xa0]: Audio: pcm_dvd, 48000 Hz, stereo, s16, 1536 kb/s
> Input #1, srt, from 'DVD-09-1993_subtitle.srt':
>   Duration: N/A, bitrate: N/A
>   Stream #1:0: Subtitle: subrip
>
> [mpeg @ 0x55aac134b140] pcm_dvd in MPEG-1 system streams is not widely
> supported, consider using the vob or the dvd muxer to force a MPEG-2
> program stream.
> Output #0, mpeg, to 'DV09-1993+srt.mpg':
>   Metadata:
>     encoder         : Lavf60.16.100
>   Stream #0:0: Video: mpeg2video (Main), yuv420p(tv, progressive), 720x576
> [SAR 16:15 DAR 4:3], q=2-31, 25 fps, 25 tbr, 90k tbn
>     Side data:
>       cpb: bitrate max/min/avg: 9000000/0/0 buffer size: 1835008
> vbv_delay: N/A
>   Stream #0:1: Audio: pcm_dvd, 48000 Hz, stereo, s16, 1536 kb/s
>   Stream #0:2: Subtitle: subrip
> Stream mapping:
>   Stream #0:1 -> #0:0 (copy)
>   Stream #0:2 -> #0:1 (copy)
>   Stream #1:0 -> #0:2 (copy)
> Press [q] to stop, [?] for help
> [out#0/mpeg @ 0x55aac134af80] video:1644910kB audio:316303kB subtitle:0kB
> other streams:0kB global headers:0kB muxing overhead: 0.561824%
> size= 1972232kB time=00:28:04.44 bitrate=9591.6kbits/s speed= 378x
>
>
> 4) Successful Playback of the final video and Audio with subtitles using a
> "reinforced" FFplay command - also found on StackOverflow
> https://stackoverflow.com/questions/50175075/can-ffplay-view-subtitles
>
> ffplay -hide_banner -vf subtitles=DVD-09-1993_subtitle.srt
> DV09-1993+srt.mpg
>

isn't this command just uses external srt and not muxed one?



Input #0, mpeg, from 'DV09-1993+srt.mpg':=    0KB sq=    0B f=0/0
>   Duration: 00:28:04.45, start: 0.540000, bitrate: 9591 kb/s
>   Stream #0:0[0x1e0]: Video: mpeg2video (Main), yuv420p(tv, progressive),
> 720x576 [SAR 16:15 DAR 4:3], 25 fps, 25 tbr, 90k tbn
>     Side data:
>       cpb: bitrate max/min/avg: 9000000/0/0 buffer size: 1835008
> vbv_delay: N/A
>   Stream #0:1[0xa0]: Audio: pcm_dvd, 48000 Hz, stereo, s16, 1536 kb/s
> [Parsed_subtitles_0 @ 0x7f7368464340] Shaper: FriBidi 0.19.6 (SIMPLE)
> HarfBuzz-ng 3.4.0 (COMPLEX)
> [Parsed_subtitles_0 @ 0x7f7368464340] Using font provider fontconfig
> [Parsed_subtitles_0 @ 0x7f7368464340] fontselect: (Arial, 400, 0) ->
> /usr/share/fonts/truetype/LiberationSans-Regular.ttf, 0, LiberationSans
>   39.75 A-V:  0.002 fd=   0 aq=  190KB vq= 1222KB sq=    0B f=0/0
>
>
> 5) Playback using VLC
>
>    - OK playback of video and subtitles when adding the subtitle file
>    - BUT: The AUDIO is lost in VLC !?
>    - Have looked into several menu items (unmute and force volume on)
>
>
> Additional I wonder:
>
> du -sh DV*.mpg
>
> 2,0G    DV09-1993.mpg (1)
> 1,9G    DV09-1993+srt.mpg (3)
>
> 6) Why is the merged (subtitled) file (3) smaller than the initial file
> (1)?
> Even that the srt file is very small, it should rather be opposite
> .........
>
> 7) And why the ffmpeg output (3), when the initial input mpg file (1) was
> created using "-f dvd -target pal-dvd", which I thought was just MPEG-2 and
> vob?
>
> [mpeg @ 0x55aac134b140] pcm_dvd in MPEG-1 system streams is not widely
> supported, consider using the vob or the dvd muxer to force a MPEG-2
> program stream.
>
>
> 8) DevedeNG got so far an error while creating the DVD iso from (3)
> Tested the movie file in the tree structure with VLC, and also that
> without audio.....
>
>
>
>
> But may be those DVD creation guis can do srt => dvd_sub conversion for
> you ?
>
>>
>> 2.1 Preferably I want to add/import subtitles as fast and easy using GUI
>> interactive tools like DeVeDeNG or VLC if possible?
>> Next thereafter could be using the more time consuming ffmpeg
>> https://www.baeldung.com/linux/subtitles-ffmpeg#how-to-add-soft-subtitles
>>
>> 2.2 So is the question if learning a special subtitle editor is necessary
>> to create the text file easier, like one of these 5
>> https://www.debugpoint.com/3-great-subtitle-editors-in-linux-systems/
>>
>> Tip, suggestions or experience how to do this?
>>
>>
>>
>>
>>
>>
>>
>> --
>> Cin mailing list
>> Cin at lists.cinelerra-gg.org
>> https://lists.cinelerra-gg.org/mailman/listinfo/cin
>>
>
>
>
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