[FFmpeg-user] Encoding an XSUB (DivX subtitles) stream (from an SRT stream)

[Clément Bœsch]

On Sun, Apr 21, 2013 at 05:17:22PM +0200, Armen Michaeli wrote:
> Hi all,
> 
> I am trying to include an XSUB stream in to an AVI container. The source of this stream comes from an SRT file, so I am using the following command line:
> 
> ffmpeg -i movie.avi -i movie.srt -scodec xsub output.avi
> 
> The subtitle encoding fails with "[xsub @ 0x7fb3f883ea00] No subtitle bitmap available.", as part of the following output:
> 
> ffmpeg version 1.2 Copyright (c) 2000-2013 the FFmpeg developers
>   built on Mar 15 2013 18:24:17 with llvm-gcc 4.2.1 (LLVM build 2336.11.00)
>   configuration: --prefix=/Volumes/Ramdisk/sw --enable-gpl --enable-pthreads --enable-version3 --enable-libspeex --enable-libvpx --disable-decoder=libvpx --enable-libmp3lame --enable-libtheora --enable-libvorbis --enable-libx264 --enable-avfilter --enable-libopencore_amrwb --enable-libopencore_amrnb --enable-filters --enable-libgsm --arch=x86_64 --enable-runtime-cpudetect
>   libavutil      52. 18.100 / 52. 18.100
>   libavcodec     54. 92.100 / 54. 92.100
>   libavformat    54. 63.104 / 54. 63.104
>   libavdevice    54.  3.103 / 54.  3.103
>   libavfilter     3. 42.103 /  3. 42.103
>   libswscale      2.  2.100 /  2.  2.100
>   libswresample   0. 17.102 /  0. 17.102
>   libpostproc    52.  2.100 / 52.  2.100
> [srt @ 0x7fb3f8818e00] Estimating duration from bitrate, this may be inaccurate
> Input #0, srt, from 'movie.srt':
>   Duration: N/A, bitrate: N/A
>     Stream #0:0: Subtitle: subrip
> Output #0, avi, to 'output.avi':
>   Metadata:
>     ISFT            : Lavf54.63.104
>     Stream #0:0: Subtitle: xsub (DXSB / 0x42535844)
> Stream mapping:
>   Stream #0:0 -> #0:0 (subrip -> xsub)
> Press [q] to stop, [?] for help
> [xsub @ 0x7fb3f883ea00] No subtitle bitmap available.
> Subtitle encoding failed
> 
> Am I doing something wrong, or is ffmpeg incapabale of doing what I am trying to do?
> 

srt/subrip subtitles are text based. xsub are bitmap based. FFmpeg doesn't
do rasterization internally. You have the possibility to use the subtitles
filter to hardburn your subtitles. See
https://ffmpeg.org/ffmpeg-filters.html#subtitles

-- 
Clément B.
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