roundup.ffmpeg.org issue 1286:

The recent changes to probing by bcoudurier (svn r19000 and r19272) broke
transcoding a 7mbit dvb tv-capture (created by vdr 1.3.37).

Output of last working ffmpeg (r18999):
FFmpeg version SVN-r18999, Copyright (c) 2000-2009 Fabrice Bellard, et al.
  configuration: --prefix=/home/pdc_pc_thuis/pkg/ffmpeg --enable-libmp3lame
--enable-libvorbis --enable-libfaad --enable-libfaac --enable-gpl
--enable-memalign-hack --enable-pthreads --cpu=athlon64 --enable-nonfree
--enable-libamr-nb --enable-libamr-wb
  libavutil     50. 3. 0 / 50. 3. 0
  libavcodec    52.29. 1 / 52.29. 1
  libavformat   52.33. 0 / 52.33. 0
  libavdevice   52. 2. 0 / 52. 2. 0
  libswscale     0. 7. 1 /  0. 7. 1
  built on Jul 21 2009 15:02:00, gcc: 4.2.4 (Ubuntu 4.2.4-1ubuntu3)

Seems stream 0 codec frame rate differs from container frame rate: 50.00
(50/1)
-> 25.00 (25/1)
Input #0, mpeg, from 'mpeg2_pes_probe_failure.mpg':
  Duration: 00:00:11.18, start: 25681.210433, bitrate: 7324 kb/s
    Stream #0.0[0x1e0]: Video: mpeg2video, yuv420p, 720x576 [PAR 64:45 DAR
16:9], 10000 kb/s, 25 tbr, 90k tbn, 50 tbc
    Stream #0.1[0x1c0]: Audio: mp2, 48000 Hz, stereo, s16, 256 kb/s
At least one output file must be specified

Output of current version:
FFmpeg version SVN-r19501, Copyright (c) 2000-2009 Fabrice Bellard, et al.
  configuration: --prefix=/home/pdc_pc_thuis/pkg/ffmpeg --enable-libmp3lame
--enable-libvorbis --enable-libfaad --enable-libfaac --enable-gpl
--enable-memalign-hack --enable-pthreads --cpu=athlon64 --enable-nonfree
--enable-version3 --enable-libopencore-amrnb --enable-libopencore-amrwb
  libavutil     50. 3. 0 / 50. 3. 0
  libavcodec    52.32. 0 / 52.32. 0
  libavformat   52.36. 0 / 52.36. 0
  libavdevice   52. 2. 0 / 52. 2. 0
  libswscale     0. 7. 1 /  0. 7. 1
  built on Jul 23 2009 13:30:26, gcc: 4.2.4 (Ubuntu 4.2.4-1ubuntu3)

Seems stream 0 codec frame rate differs from container frame rate: inf (1/0)
->
90000.00 (90000/1)
Input #0, mpeg, from 'mpeg2_pes_probe_failure.mpg':
  Duration: 00:00:11.18, start: 25681.210433, bitrate: 7324 kb/s
    Stream #0.0[0x1e0]: Video: 0x0000, 90k tbr, 90k tbn
    Stream #0.1[0x1c0]: Audio: mp2, 48000 Hz, 2 channels, s16, 256 kb/s
At least one output file must be specified

Output of current version after increasing MAX_PROBE_PACKETS from 100 to
500:
FFmpeg version SVN-r19501, Copyright (c) 2000-2009 Fabrice Bellard, et al.
  configuration: --prefix=/home/pdc_pc_thuis/pkg/ffmpeg --enable-libmp3lame
--enable-libvorbis --enable-libfaad --enable-libfaac --enable-gpl
--enable-memalign-hack --enable-pthreads --cpu=athlon64 --enable-nonfree
--enable-version3 --enable-libopencore-amrnb --enable-libopencore-amrwb
  libavutil     50. 3. 0 / 50. 3. 0
  libavcodec    52.32. 0 / 52.32. 0
  libavformat   52.36. 0 / 52.36. 0
  libavdevice   52. 2. 0 / 52. 2. 0
  libswscale     0. 7. 1 /  0. 7. 1
  built on Jul 23 2009 13:32:06, gcc: 4.2.4 (Ubuntu 4.2.4-1ubuntu3)
[mpeg2video @ 0x8a41c30]ac-tex damaged at 24 0
[mpeg2video @ 0x8a41c30]Warning MVs not available
[mpeg2video @ 0x8a41c30]concealing 1620 DC, 1620 AC, 1620 MV errors

Seems stream 0 codec frame rate differs from container frame rate: 50.00
(50/1)
-> 25.00 (50/2)
Input #0, mpeg, from 'mpeg2_pes_probe_failure.mpg':
  Duration: 00:00:11.18, start: 25681.210433, bitrate: 7324 kb/s
    Stream #0.0[0x1e0]: Video: mpeg2video, yuv420p, 720x576 [PAR 64:45 DAR
16:9], 10000 kb/s, 25 tbr, 90k tbn, 50 tbc
    Stream #0.1[0x1c0]: Audio: mp2, 48000 Hz, 2 channels, s16, 256 kb/s
At least one output file must be specified

Note the [mpeg2video ... warnings, many more of these appear when trying to
transcode.