Adding DVB subtitles to the video

[wotdefcuk]

I have an h.264/avc video in mp4 container.
I want to add subtitles in the dvb format using ffmpeg. If this possible?

I am trying

ffmpeg -i input.mp4 -i subtitle.sub -c:v copy -c:a copy -c:s dvbsub output.mp4

But then I get the fatal error

Stream mapping:
  Stream #0:0 -> #0:0 (h264 -> libx264)
  Stream #0:1 -> #0:1 (aac -> libvo_aacenc)
  Stream #1:0 -> #0:2 (subrip -> dvbsub)
Could not write header for output file #0 (incorrect codec parameters ?): Operation not permitted

Can I even use ffmpeg or will I have to something else?

[poisondeathray]

Not possible with ffmpeg . It's been on the "to do" list for a few years. Don't hold your breath

[wotdefcuk]

Can anyone tell me if mp4 supports dvb subtitles?

Does anyone have a sample file containing dvb subtitles? any format and any container?

[Selur]

Can anyone tell me if mp4 supports dvb subtitles

iirc it supports:
a. CC
b. ttxt subtitles
c. idx/sub subtitles

you might want to read: http://www.iphonelife.com/blog/87/how-you-can-convert-your-dvb-recordings-subtitles-id...-mp4-subtitles