Closed Captions - Embedded in AVI

[talbot_sk]

Hi. I would like programatticaly embed closed captions to AVI. I found http://www.alexander-noe.com/video/documentation/avi.pdf document. I know that I must create GAB2 chunk, but I do not know how should AVISTREAMHEADER look like, how strf should look like and what entry should be written in the idx1 index at the end of AVI file. Any help would be appreciated. Could anyone send me an example video with embedded GAB2 closed captions?
B.

[Baldrick]

I have not seen any such avi and does any player support that?

I would head over to forum.doom9.org and ask there also.

[talbot_sk]

Of course such videos exist. A lot of players support that. E.g. Windows Media Player/Play/Lyrics, Captions, and Subtitles/On if Available.

[netmask56]

Is this what you are referring to?
https://www.videohelp.com/tools/AVIAddXSubs

[Baldrick]

I'm thinking of closed captions in mpeg2/ts streams.

[netmask56]

http://www.pixeltools.com/tech_tip_closed_captioning.html

[talbot_sk]

Is this what you are referring to?
https://www.videohelp.com/tools/AVIAddXSubs

Thank you, but this is not exactly what I want. AVIAddXSubs adds subtitles as some kind of "transparent" frames into second video stream. Finally player draws this second stream with subtitle frames onto original main video stream. Also http://www.pixeltools.com/tech_tip_closed_captioning.html works by this way.
But I would like to encode raw subtitles into video as it is written in http://www.alexander-noe.com/video/documentation/avi.pdf document. So user can later during playback change subtitles font, color, position etc. as subtitles would stored in separate .srt/.sub file.

[handyguy]

I never saw CC's in an AVI. Sometimes CC's are converted to Subs, but also contain CC data (door opening). IF you ever make one let us know.

[jman98]

talbot_sk - Closed captions and subtitles are not the same. The document you refer to talks about subtitles.

[usually_quiet]

Aegisub, VSFilter / DirectVobSub, and Virtualdub are other tools I've seen mentioned as being used in combination to add subtitles to .avi files. Maybe they will do what you want, but I don't know for sure. I have never used these myself, because I don't use .avi containers, but there is a tutorial on YouTube. http://www.youtube.com/watch?v=v0NojT5M8iQ

For N. Americans, closed captions are a special form of subtitling used for TV and sometimes commercial DVDs. The closest equivalent would be teletext, but the implementation of N. American closed captions is different. They are not used outside of N. America, as far as I know.

[Edit]I remembered another program used for subtitling .avi , AVIMux GUI (Alexander Noé is the author of this one.)

[handyguy]

But you can really do CC's in flash with this free software from PBS:
http://ncam.wgbh.org/invent_build/web_multimedia/tools-guidelines/ccforflash

[talbot_sk]

Hi. Long time ago I created video with embeded subtitles. You can view it using e.g. VLC. Now I would like to share one with you, see the attachment. It contains embedded SRT subtitles marked with GAB2 fourcc. I did it following this document: http://www.alexander-noe.com/video/documentation/avi.pdf and Microsoft AVI specification http://msdn.microsoft.com/en-us/library/ms779636.aspx. It was quite difficult, but I did it.

[Baldrick]

Nice. But what players supports this? It worked with VLC but it requires some external filter for wmp?

[talbot_sk]

I do not know exactly. My WMP shows embedded subtitles too. I installed K-Lite Mega Codec Pack. WMP uses DirectVobSub (auto-loading version) and ffdshow video decoder.