[FFmpeg-user] Exactly one WebVTT stream is needed

[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?

-- 
Simon Thelen