UPDATE

On 10/06/2025 10.46, Paul B Mahol wrote:
On Tue, Jun 10, 2025 at 2:37 PM Mark Filipak <
markfilipak.imdb-at-gmail....@ffmpeg.org> wrote:

Thank you, Paul.

ffmpeg^
   -i "y:\BDMV\STREAM\00000.m2ts"^
   -map 0:s:0 -s 1920x1080 -c:s dvdsub^
   "c:\2001, A SPACE ODYSSEY [1968].sup"

It failed:
(The conversion to dvdsub seemed to go fine. The problem seems to be with
the sup muxer.)

Replace "-c:s dvdsub" with "-c:s copy".

That works -- it executes without error -- but it doesn't work -- SubtitleEdit 
will not accept pgssub.

I need to convert pgssub to dvdsub to make SubtitleEdit happy.

***** UPDATE: That works!

ffmpeg^
 -i "y:\BDMV\STREAM\00000.m2ts"^
 -map 0:s:0 -s 1920x1080 -c:s copy^
 "c:\2001, A SPACE ODYSSEY [1968] try.sup"

"c:\Program Files\Subtitle Edit\SubtitleEdit"^
 "c:\2001, A SPACE ODYSSEY [1968] try.sup"

SubtitleEdit _did_ accept pgssub. It did launch, and it launched in OCR mode!

So, it appears that, instead of not accepting pgssub, there may be a problem with the way SubtitleEdit handles pgssub-in-m2ts.

So, I can now combine Steps 2 & 3 into a single Step. If the suggested pgssub-in-m2ts to dvdsub-in-mp4 also works -- I foresee no reason why it wouldn't -- then I should be able to do this: pgssub-in-m2ts to pgssub-in-mp4 to SubtitleEdit. That would fold my Steps 2 & 3 into Step 1! That would turn my 5-Step factory into a 3-Step factory and save me about 10 minutes per movie.
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