[FFmpeg-trac] #1196(avfilter:new): drawtext parameter keys "n" and "t" not working

FFmpeg trac at avcodec.org
Fri Apr 13 05:35:10 CEST 2012


#1196: drawtext parameter keys "n" and "t" not working
----------------------------------+---------------------------------------
             Reporter:  ad        |                     Type:  defect
               Status:  new       |                 Priority:  important
            Component:  avfilter  |                  Version:  unspecified
             Keywords:            |               Blocked By:
             Blocking:            |  Reproduced by developer:  0
Analyzed by developer:  0         |
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 I tried using drawtext's "n" and "t" parameter keys using the example
 below:

 ffmpeg -vsync 0 -t 10 -i in)video.mp4 -vf
 drawtext="fontfile=/usr/share/fonts/truetype/ttf-
 dejavu/DejaVuSerif.ttf:text='Text at 5 Looks
 good':fontsize=20:fontcolor=red:x=100:y=100:n=688" out.mp4

 [drawtext @ 0xa64ca40] Key 'n' not found.
 [drawtext @ 0xa64e6c0] Error parsing options string:
 'fontfile=/usr/share/fonts/truetype/ttf-dejavu/DejaVuSerif.ttf:text=Text
 at 5 Looks good:fontsize=20:fontcolor=red:x=100:y=100:n=688'
 Error initializing filter 'drawtext' with args
 'fontfile=/usr/share/fonts/truetype/ttf-dejavu/DejaVuSerif.ttf:text=Text
 at 5 Looks good:fontsize=20:fontcolor=red:x=100:y=100:n=688'

 I get same error with "t" parameter.

 If anyone knows if these parameters work, please give a usage example.

 Otherwise, do you have any advice on how to achieve objective "1--" and
 "2--" below?

 1-- Overlay text 10 seconds into the video.
 2-- Overlay text over video at 1 second intervals into the video.
       The text last for 1 second or specified duration.

 I am trying to use drawtext filter to overlay text 10 seconds into the
 video. I couldn't find any solution using drawtext filter. i.e.
 How to overlay text at specified seconds/frame into the video?

-- 
Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/1196>
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