WTV format

[wonmanfactory]

Thank you for the detailed explanation.
Sorry if this is a stupid question.
Microsoft TV subtitles Decoder filter is a one-way in filter. How do you use that to display subtitles on GraphEdit?
What filter do you use for exporting subtitles?

[usually_quiet]

Sorry if this is a stupid question.
Microsoft TV subtitles Decoder filter is a one-way in filter. How do you use that to display subtitles on GraphEdit?

I don't know the answer to that question.

What filter do you use for exporting subtitles?

I replaced the Microsoft TV Subtitles Decoder filter with the Dump filter to try to capture data from the DVR-4 pin.

[wonmanfactory]

Thank you so much. Once I am able to extract the subtitles, I am going to reveal the method here.

[wonmanfactory]

Hello
I am writing to report that I am able to process WTV file with the subtitle stream although I found out Teletext is not extractable, because it is pixel based captions.

I spent weeks on studying DirectShow and media foundation programming which turned out to be futile.

I simply used FFMPEG to compress and converted caption streams by using

This is the sample wtv file I have done.



ffmpeg -I "input.wtv" -map 0:1(video stream) -map 0:2(audio stream) -map 0:3 -c:v libx264 (mp4 codec) -c:a:0 libmp3lame (mp3 codec) -c: s copy "output.mkv"

or you can export only the caption stream by

ffmpeg -I "input.wtv" -map 0:3 -c: s copy "output.mkv"

It seems that the mkv format is the only format which carries subtitle streams.

I will try to create some program using pattern recognition to convert WTV captions to srt. I will post it here.

[Bonnevue]

dvb subtitles in ffmpeg.

try this: -vcodec (whatever you want) -acodec (whatever you want) -scodec dvdsub whateveryouwant.mkv