[FFmpeg-user] Exactly one WebVTT stream is needed

[Thomas Berberich]

Is there any way in ffmpeg to convert dvb_teletext into webvtt, so
Teletext is accessiable on HLS-Stream also?


I'll try to record a Stream in the next days.
Where i have to send the Video sample, if i have it recorded?


Am 21.11.2015 um 19:09 schrieb Simon Thelen:
> On 15-11-20 at 22:50, Cloudclimber wrote:
>> Hi there,
>>
>> this command works without Problems in ffmpeg 2.7.2:
>>
>> |./ffmpeg -i udp://@239.100.1.1:1234 -map 0 -probesize 100
>> -analyzeduration 100 -c copy -copy_unknown -f hls -hls_time 10 -hls_wrap
>> 10 -hls_list_size 10 /var/www/test1_.m3u8
>>
>> but since |ffmpeg 2.8.0 i got the Output below, even with ffmpeg 2.8.2 .
>> Sure i could exclude subtitle Streams, but i want to have dvb_teletext
>> in the stream also, so this is no solution.
>>
>> Anyone has an idea how to map all streams, inclusive subtitle streams
>> with ffmpeg 2.8.2?
> FFmpeg does not support muxing of any subtitle stream other than WebVTT
> in HLS, and muxing dvb_teletext into WebVTT doesn't work.
>
>> OUTPUT:
>> ====================
>> root at ffmpegserver:~/ffmpeg-2.8.2-64bit-static# ./ffmpeg -i
>> udp://@239.100.1.1:1234 <udp://@239.100.1.1:1234/> -map 0 -probesize 100
>> -analyzeduration 100 -c copy -copy_unknown -f hls -hls_time 10 -hls_wrap
>> 10 -hls_list_size 10 /var/www/test1_.m3u8 -loglevel debug
>> ffmpeg version 2.8.2-static http://johnvansickle.com/ffmpeg/ Copyright
>> (c) 2000-2015 the FFmpeg developers
>> built with gcc 5.2.1 (Debian 5.2.1-23) 20151028
>> configuration: --enable-gpl --enable-version3 --disable-shared
>> --disable-debug --enable-runtime-cpudetect --enable-libmp3lame
>> --enable-libx264 --enable-libx265 --enable-libwebp --enable-libspeex
>> --enable-libvorbis --enable-libvpx --enable-libfreetype
>> --enable-fontconfig --enable-libxvid --enable-libopencore-amrnb
>> --enable-libopencore-amrwb --enable-libtheora --enable-libvo-aacenc
>> --enable-libvo-amrwbenc --enable-gray --enable-libopenjpeg
>> --enable-libopus --enable-libass --enable-gnutls --enable-libvidstab
>> --enable-libsoxr --enable-frei0r --enable-libfribidi
>> --disable-indev=sndio --disable-outdev=sndio --cc=gcc
>> 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
>> libswscale 3. 1.101 / 3. 1.101
>> libswresample 1. 2.101 / 1. 2.101
>> libpostproc 53. 3.100 / 53. 3.100
> [..]
>> Successfully opened the file.
>> Parsing a group of options: output file /var/www/test1_.m3u8.
>> Applying option map (set input stream mapping) with argument 0.
>> Applying option c (codec name) with argument copy.
>> Applying option f (force format) with argument hls.
>> Successfully parsed a group of options.
>> Opening an output file: /var/www/test1_.m3u8.
>> Successfully opened the file.
>> [webvtt @ 0x3fb80c0] Exactly one WebVTT stream is needed.
>> [mpegts @ 0x3fb7ae0] muxrate VBR, pcr every 2 pkts, sdt every 200,
>> pat/pmt every 40 pkts
>> Segmentation fault (core dumped)
> What interests me more is why ffmpeg is segfaulting. Can you provide a
> sample with which this can be reproduced or a gdb backtrace of the debug
> build?
>