[Cin] Adding soft subtitles to a DVD video
Terje J. Hanssen
terjejhanssen at gmail.com
Tue Feb 13 16:49:13 CET 2024
Den 13.02.2024 14:31, skrev Terje J. Hanssen:
>
>
> Den 13.02.2024 03:26, skrev Andrew Randrianasulu:
>>
>>
>> вт, 13 февр. 2024 г., 05:20 Andrew Randrianasulu
>> <randrianasulu at gmail.com>:
>>
>>
>>
>> вт, 13 февр. 2024 г., 03:42 Terje J. Hanssen
>> <terjejhanssen at gmail.com>:
>>
>>
>>
>> Den 12.02.2024 00:07, skrev Andrew Randrianasulu:
>>>
>>>
>>> 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
>>>
>>> /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/
>>
>>
>>
>> also be aware about non-utf8 subtitles with this method (possibly
>> rare nowadays but still). devede-ng should have dropdown menu for
>> selecting it.
>>
>> https://groups.google.com/g/devede-forum/c/2Thoie_DSXQ
>>
>
> Now I have tried both ASII, UTF-8 and ISO-8859-1 encodings, but still
> DevedeNG exists with error, also already when trying the Preview button.
> DevedeNG 4.17 has a newer gui and I cannot see there is any Advanced
> button for Mencoder.
> I also tried to add a pure dv clip and a srt subtitle file in Devede,
> and got the error again.
>
>
Checking the character set of my srt subtitle file:
file -bi dvd.srt
text/plain; charset=us-ascii
Looks like I am not able to change the charset to utf-8
iconv -f ascii -t utf-8 -o dvd_utf-8.srt dvd.srt
file -bi dvd_utf-8.srt
text/plain; charset=us-ascii
https://www.shellhacks.com/linux-check-change-file-encoding/
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