ffmpeg2theora.linux core dump on src/theorautils.c:559: write_seek_index: Assertion `info->with_seek_index' failed.

I donwloaded latest nightly binary from http://firefogg.org/nightly/ffmpeg2theora.linux

ffmpeg2theora 0.25+svn16683 - Xiph.Org libtheora 1.1 20090822 (Thusnelda)

when encoding with these parameters

ffmpeg2theora.linux --optimize --speedlevel 0 --no-upscaling --two-pass -V 400 --videoquality 5 --audioquality 1

I'm getting this error

Input #0, flv, from 'download1.flv':
  Duration: 00:08:39.51, start: 0.000000, bitrate: 1843 kb/s
    Stream #0.0: Video: vp6f, yuv420p, 662x372, 1843 kb/s, 25 tbr, 1k tbn, 1k tbc
    Stream #0.1: Audio: mp3, 44100 Hz, 2 channels, s16

  0:08:39.51 audio: 63kbps video: 1180kbps, time elapsed: 00:17:12 0:08:39.52 audio: 63kbps video: 1180kbps, time elapsed: 00:17:12 ffmpeg2theora.linux: src/theorautils.c:559: write_seek_index: Assertion `info->with_seek_index' failed.
Aborted (core dumped [obraz paměti uložen])

---

other file:

Input #0, flv, from 'download2.flv':
  Duration: 00:04:00.63, start: 0.000000, bitrate: 276 kb/s
    Stream #0.0: Video: flv, yuv420p, 320x240, 276 kb/s, 25 tbr, 1k tbn, 1k tbc
    Stream #0.1: Audio: mp3, 22050 Hz, 1 channels, s16

  0:04:00.68 audio: 35kbps video: 402kbps, time elapsed: 00:01:58 ffmpeg2theora.linux: src/theorautils.c:559: write_seek_index: Assertion `info->with_seek_index' failed.
Aborted (core dumped [obraz paměti uložen])