Creating MP4 subtitles with gstreamer

[Jérôme Carretero]

Hi,


firex answered me on IRC:

 gst-launch-1.0 filesrc location=test.srt ! text/x-raw,format=\(string\)utf8 \
   ! mux.subtitle_0 \
  videotestsrc num-buffers=300 ! videoconvert !x264enc ! mux. \
  mp4mux name=mux ! filesink location=out.mp4


Thanks (more questions to come ;),

-- 
cJ

On Thu, 16 Apr 2015 08:39:26 -0400
Jérôme Carretero <cJ-gst at zougloub.eu> wrote:

> Hi,
> 
> 
> 
> I would like to create MP4 subtitles (3GPP timed text aka. 3GPP TS
> 26.245) with gstreamer, whether using command line or a more advanced
> programmatic pipeline.
> 
> With ffmpeg I could do something like:
> 
>   ffmpeg -i a.mp4 -f srt -i b.srt -c:v copy -c:a copy -c:s mov_text
>   c.mp4
> 
> Note that I am *not* talking about burning subtitles in video frames,
> which is widely covered in tutorials.
> 
> I've been trying:
> 
>   gst-launch-1.0 \
>    mp4mux name=mux ! filesink location=out.mp4. \
>    filesrc location=test.srt ! subparse ! mux. \
>    videotestsrc num-buffers=300 ! videoconvert \
>     ! x264enc bitrate=4000 threads=0 ! mux.
> 
> But it says:
> 
> Setting pipeline to PAUSED ...
> Pipeline is PREROLLING ...
> ERROR: from element /GstPipeline:pipeline0/GstFileSrc:filesrc0:
> Internal data flow error. Additional debug info:
> /var/tmp/paludis/media-libs-gstreamer-1.4.5/work/gstreamer-1.4.5/libs/gst/base/gstbasesrc.c(2933):
>  gst_base_src_loop (): /GstPipeline:pipeline0/GstFileSrc:filesrc0:
> streaming task paused, reason not-negotiated (-4)
> ERROR: pipeline doesn't want to preroll.
> Setting pipeline to NULL ...
> Freeing pipeline ...
> 
> 
> I haven't started to dig into the code yet, and was wondering if
> somebody could tell me either what I'm doing wrong, or what is the
> support level of that kind of things.
> 
> 
> Thanks,
>