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@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

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
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

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?

 
 



 
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