[FFmpeg-user] Extracting stills frames from a DVB-T MPEG transport stream with subtitles

[Tom Crane]

Dear All,
 	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?


The relevant part of the dvb.ts file's contents from ffprobe are,

Input #0, mpegts, from 
'dvb.ts':
   Duration: 00:02:00.18, start: 52229.147411, bitrate: 24040 kb/s
   Program 1542
     Metadata:
       service_name    : TMC
       service_provider: SMR6
     Stream #0:26[0x26c]: Video: h264 (High) ([27][0][0][0] / 0x001B), yuv420p(tv, bt709, top first), 1920x1080 [SAR 1:1 DAR 16:9], 25 fps, 25 tbr, 90k tbn, 50 tbc
     Stream #0:27[0x276](fra): Audio: eac3 ([6][0][0][0] / 0x0006), 48000 Hz, stereo, fltp, 128 kb/s
     Stream #0:28[0x277](qaa): Audio: eac3 ([6][0][0][0] / 0x0006), 48000 Hz, stereo, fltp, 128 kb/s
     Stream #0:29[0x278](fra): Audio: eac3 ([6][0][0][0] / 0x0006), 48000 Hz, stereo, fltp, 96 kb/s (visual impaired) (descriptions)
     Stream #0:30[0x28a](fra): Subtitle: dvb_subtitle ([6][0][0][0] / 0x0006) (hearing impaired)
     Stream #0:31[0x28b](fra): Subtitle: dvb_subtitle ([6][0][0][0] / 0x0006)
     Stream #0:7[0xaa]: Unknown: none ([5][0][0][0] / 0x0005)


$ ffmpeg -version
ffmpeg version N-96647-g343ccfcc4d Copyright (c) 2000-2020 the FFmpeg 
developers
built with gcc 9.2.0 (GCC)
configuration: --prefix=/usr --libdir=/usr/lib64 --shlibdir=/usr/lib64 
--docdir=/usr/doc/ffmpeg-git-20200206/html --mandir=/usr/man 
--disable-debug --enable-shared --disable-static --enable-gpl 
--enable-version3 --enable-avresample --arch=x86_64 --disable-encoder=aac 
--enable-libfontconfig --enable-libfreetype --enable-libfribidi 
--enable-gnutls --enable-libbluray --enable-libcaca --enable-libcdio 
--enable-libopus --enable-librtmp --enable-libspeex --enable-libssh 
--enable-libtheora --enable-libv4l2 --enable-libvorbis --enable-libvpx 
--enable-libwebp --enable-libx264 --enable-libx265 --enable-libxvid 
--enable-libmp3lame --enable-opencl --enable-opengl --enable-libopenjpeg 
--enable-libpulse --enable-libsmbclient --enable-libwavpack
libavutil      56. 39.100 / 56. 39.100
libavcodec     58. 68.100 / 58. 68.100
libavformat    58. 38.100 / 58. 38.100
libavdevice    58.  9.103 / 58.  9.103
libavfilter     7. 74.100 /  7. 74.100
libavresample   4.  0.  0 /  4.  0.  0
libswscale      5.  6.100 /  5.  6.100
libswresample   3.  6.100 /  3.  6.100
libpostproc    55.  6.100 / 55.  6.100

Thanks
Tom Crane