[FFmpeg-devel] {WIP} {HELP} Dvb Subtitles and Hard Subtitles

JULIAN GARDNER joolzg at btinternet.com
Wed Jun 15 14:10:58 CEST 2011

>>I am a bit busy but if you have a reproduceable testcase i could try
>>to take a look
>>Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB
>>The real ebay dictionary, page 1
>>"Used only once"    - "Some unspecified defect prevented a second use"
>>"In good condition" - "Can be repaird by experienced expert"
>>"As is" - "You wouldnt want it even if you were payed for it, if you knew ..."
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>Thanks for the offer, i have uploaded a file to
>url: tvonip.dk
>username: ffmpeg
>password: devel
>The file is BitrateNotUpdate.ts
>If you use the command line
>ffmpeg -i BitrateNotUpdate.ts -f mpegts -y a.ts
>all is good, but
>ffmpeg -i BitrateNotUpdate.ts -scodec dvbsub -f mpegts -y a.ts
>Will still work but the bitrate will stay at 0.0 until it finishes, but with a live stream ffmpeg seems to timeout and just drops to the cli without an error, for this you will need a much bigger file.
>ffmpeg-devel mailing list
>ffmpeg-devel at ffmpeg.org

Whilst hopefully Micheal is looking into the problem when dvbsubs being marked as available but not being present ive been testing different streams and have a few questions and problems.

1. I have some AVIs with .sub and .idx files, now the problem is that the .sub says it starts at 77 seconds, but in the idx it says it starts at 127 seconds. Should we be able to use the idx file or should we be able to add an offset so the subtitles appear at the right time?

2. Encode a file with hard subs and resized to cif all ok, do the same with soft subtitles and you get a mess as the subtitles are looking for a full frame, should be maybe look at resizing the subtitles before encoding depending on outgoing screen size?

3. srt, any volounteers to change .srt to create a bitmap on decode?

4. logo insertion? anybody want it adding. what i was thinking was to build a AVSubtitle struct with the logo, and as i do with hardsubs just add it to the screen.

5. dvdsubs dont look as nice as they do on VLC.


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