Dear all, My video file is mpegts with 1 stream dvb teletext subtitle. The teletext subtitle contains 3 pages (see tag language below) for the same language (deaf people and more). There is a -txt_page option for the libzvbi-teletext decoder to specify the page number.
How can I know which are the available -txt_page number to use, please ? I found a debug log with this info output during decoding https://github.com/FFmpeg/FFmpeg/blob/master/libavcodec/libzvbi-teletextdec.c#L297 But this is definitely not what one would want to use programmatically. Maybe streams « extradata » have the information but I am not sure about how to extract the information from there (see ffprobe below). Thank you very much in advance for your help ! Cheers, CH. ffprobe -print_format json -show_data -show_streams -select_streams s mymovie.m2ts | python -m son.tool fprobe version 2.8.3 Copyright (c) 2007-2015 the FFmpeg developers built with gcc 5.2.0 (GCC) configuration: --prefix=/usr --disable-debug --disable-static --disable-stripping --enable-avisynth --enable-avresample --enable-fontconfig --enable-gnutls --enable-gpl --enable-ladspa --enable-libass --enable-libbluray --enable-libdcadec --enable-libfreetype --enable-libfribidi --enable-libgsm --enable-libmodplug --enable-libmp3lame --enable-libopencore_amrnb --enable-libopencore_amrwb --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libv4l2 --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxvid --enable-shared --enable-version3 --enable-x11grab --enable-nonfree --enable-libfdk-aac --enable-libzvbi libavutil 54. 31.100 / 54. 31.100 libavcodec 56. 60.100 / 56. 60.100 libavformat 56. 40.101 / 56. 40.101 libavdevice 56. 4.100 / 56. 4.100 libavfilter 5. 40.101 / 5. 40.101 libavresample 2. 1. 0 / 2. 1. 0 libswscale 3. 1.101 / 3. 1.101 libswresample 1. 2.101 / 1. 2.101 libpostproc 53. 3.100 / 53. 3.100 { "streams": [ { "index": 4, "codec_name": "libzvbi_teletextdec", "codec_long_name": "Libzvbi DVB teletext decoder", "codec_type": "subtitle", "codec_time_base": "1/90000", "codec_tag_string": "[6][0][0][0]", "codec_tag": "0x0006", "width": 492, "height": 250, "id": "0x155", "r_frame_rate": "0/0", "avg_frame_rate": "0/0", "time_base": "1/90000", "start_pts": 5735141496, "start_time": "63723.794400", "duration_ts": 647953135, "duration": "7199.479278", "extradata": "\n00000000: 0900 2888 1089 ..(...\n", "disposition": { "default": 0, "dub": 0, "original": 0, "comment": 0, "lyrics": 0, "karaoke": 0, "forced": 0, "hearing_impaired": 0, "visual_impaired": 0, "clean_effects": 0, "attached_pic": 0 }, "tags": { "language": "fre,fre,fre" } } ] } _______________________________________________ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-user
