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

2020-06-19 Thread 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
libavformat58. 38.100 / 58. 38.100
libavdevice58.  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
libpostproc55.  6.100 / 55.  6.100

Thanks
Tom Crane
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Re: [FFmpeg-user] Extracting stills frames from a DVB-T MPEG transport stream with subtitles

2020-06-20 Thread Tom Crane 

On Sat, 20 Jun 2020, Hans Carlson wrote:


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.




[cut]

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


Many thanks for that which does exactly what I wanted.


Add other options as necessary to get desired quality.


Adding '-qscale:v 1' provided the required quality.

Best regards
Tom Crane
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