[Cin] Adding soft subtitles to a DVD video

Tue Feb 13 03:20:32 CET 2024

вт, 13 февр. 2024 г., 03:42 Terje J. Hanssen <terjejhanssen at gmail.com>:

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> Den 12.02.2024 00:07, skrev Andrew Randrianasulu:
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> пн, 12 февр. 2024 г., 02:02 Terje J. Hanssen <terjejhanssen at gmail.com>:
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>>
>>
>> Den 11.02.2024 04:36, skrev Terje J. Hanssen:
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>>
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>> Den 11.02.2024 00:57, skrev Andrew Randrianasulu:
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>> 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?
>
>
> Yes, I think you'r right, and I wondered a bit about it, but had no
> keyboard shortcut for ffplay to test switching subtitles on and off.
>
> So, afterwards I was more convinced - and fooled, when both Gnome Media
> player (Totem) and SMplayer automatically displayed the subtitles.
> But that was when the srt subtitle file had the same name as the mpg video
> file and was located in the same directory. But this worked as well with
> the first mpg file (1).
>
> The command line "vlc dvd.mpg dvd.srt" also worked with audio. Why both
> VLC and MPlayer lost the audio with the srt muxed mpg file I have no idea
> about.
> -----------------------------
>
> From your first reply:
>
> rendering text as palletized picture and then muxing it into mpeg stream
> is unavoidable step,as far as I understand.
> But may be those DVD creation guis can do srt => dvd_sub conversion for
> you ?
>
>
> Andrey mentioned the "srt2vobsub" program,  which seems to the same as the
> "srt2vob" script for DVD and "2dsub" for BD vobsub
>
> https://web.archive.org/web/20130728210155/https://code.google.com/p/srt2vob
>
>
> And from my reference to g-raffa:
>
> PRE-RENDERED SUBTITLES
>     they are added (muxed) to the video stream as images with minimal
> information but can be separated (demuxed) when needed. They are used in
> DVDs         and they can be turned on and off.
>     Most DVD authoring applications are capable of transcoding external
> subtitles to pre-rendered subtitles and of muxing them to the video stream.
>
>
> Regarding the last sentece, this article describes the wanted solution -
> but on Linux ...?
> https://robots.net/tech/how-to-burn-dvd-with-subtitles-srt/
>
> while another article points on Handbrake as the best solution for  most
> users (?)
> https://helpdeskgeek.com/how-to/how-to-burn-a-dvd-disc-with-subtitles/
>
>
> Re 8) above
> I also send a request to Raster soft why DeVeDeNG exits with an error
> before finishing the mpg video file and creating the iso.
>

may be this tip from 2015 will help with devede-ng too?

https://momentstuff.wordpress.com/2015/10/29/subtitles-with-devede/

>
>
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> 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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