[FFmpeg-user] pgssub to dvbsub: Subtitle encoding failed

[Klaus Kudielka]

I'm trying to transcode pgssub streams into dvbsub streams
(which my TV is supposed to display).

As far as I know, both formats are bitmap based, so this should work.

Unfortunately, ffmpeg persistently aborts with "Subtitle encoding failed".
Any idea?

ffmpeg -i x.mkv -map 0 -c:v copy -vbsf h264_mp4toannexb -c:a copy -c:s dvbsub -y x.ts
ffmpeg version 0.8.7.git-f88d5df, Copyright (c) 2000-2011 the FFmpeg developers
  built on Dec  4 2011 14:27:14 with gcc 4.6.1
  configuration: --enable-gpl --enable-libfaac --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libtheora --enable-libvorbis --enable-libx264 --enable-nonfree --enable-postproc --enable-version3 --enable-x11grab --enable-libxvid --enable-libvpx --enable-librtmp --enable-shared --extra-cflags=-I/opt/x264/include --extra-ldflags=-L/opt/x264/lib --prefix=/opt/ffmpeg
  libavutil    51. 30. 0 / 51. 30. 0
  libavcodec   53. 40. 0 / 53. 40. 0
  libavformat  53. 24. 0 / 53. 24. 0
  libavdevice  53.  4. 0 / 53.  4. 0
  libavfilter   2. 50. 0 /  2. 50. 0
  libswscale    2.  1. 0 /  2.  1. 0
  libpostproc  51.  2. 0 / 51.  2. 0
Input #0, matroska,webm, from 'x.mkv':
  Metadata:
    ENCODER         : Lavf53.24.0
  Duration: 00:00:22.11, start: 0.000000, bitrate: 4650 kb/s
    Chapter #0.0: start 0.000000, end 22.000000
    Metadata:
      title           : Chapter 00
    Stream #0:0(eng): Video: h264 (High), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], 23.98 fps, 23.98 tbr, 1k tbn, 47.95 tbc (default)
    Stream #0:1(deu): Audio: ac3, 48000 Hz, 5.1(side), s16, 448 kb/s (default)
    Metadata:
      title           : 3/2+1
      LANGUAGE        : deu
    Stream #0:2(ger): Subtitle: hdmv_pgs_subtitle (default)
[mpegts @ 0x24b6be0] muxrate VBR, pcr every 2 pkts, sdt every 200, pat/pmt every 40 pkts
Output #0, mpegts, to 'x.ts':
  Metadata:
    encoder         : Lavf53.24.0
    Chapter #0.0: start 0.000000, end 22.000000
    Metadata:
      title           : Chapter 00
    Stream #0:0(eng): Video: h264, yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], q=2-31, 23.98 fps, 90k tbn, 23.98 tbc (default)
    Stream #0:1(deu): Audio: ac3, 48000 Hz, 5.1(side), 448 kb/s (default)
    Metadata:
      title           : 3/2+1
      LANGUAGE        : deu
    Stream #0:2(ger): Subtitle: dvb_subtitle (default)
Stream mapping:
  Stream #0:0 -> #0:0 (copy)
  Stream #0:1 -> #0:1 (copy)
  Stream #0:2 -> #0:2 (pgssub -> dvbsub)
Press [q] to stop, [?] for help
Subtitle encoding failed