On Sat, 20 Jun 2020, Tom Crane wrote:
I am attempting to extract still frames from a video stream in a
multi-channel DVB-T MPEG transport stream, for example every 2 seconds,
with selected accompanying subtitles but can't get it to work.
This example command successfully extracts frames from video stream 0:26 to
jpeg files.
ffmpeg -i dvb.ts -map 0:26 -qscale:v 1 -r 0.5 stills%04d.jpg
This one successfully copies the same file's video stream 0:26 along
with subtitle stream 0:30 to a video file in a Matroska container.
ffmpeg -i dvb.ts -map 0:26 -c:v copy -map 0:30 -c:s copy tmp.mkv
Is there a way to combine the two to capture still frames from the video
stream to JPEG files including the accompanying subtitles?
If you want to create 2 images/frame - 1 with the video and another with
the subtitle, then use your first command for the video and try something
like the following for the subtitle:
ffmpeg -i dvb.ts -r 0.5 -lavfi "[0:30]null[sub]" -map "[sub]" subs-%04d.jpg
If you want to combine the video and the sub into a single image, then
try the overlay filter, eg:
ffmpeg -i dvb.ts -filter_complex "[0:26][0:30]overlay" -r 0.5 stills-%04d.jpg
Add other options as necessary to get desired quality. You might want to
test it on a small section that you know contains subtitles using -ss/-t.
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