[FFmpeg-user] AVC / AAC 2 passes , Incomplete MB-tree stats file. message

[jacky]

Good morning

I try to encode vob to flv AVC/AAC 2 passes and I am getting a
Incomplete MB-tree stats file. message before stops without outputs
the first pass is fine , the second does not complete

here is my batch file
set lcmdv1=    -vcodec libx264  -profile:v main  -b:v 350k -r:v 25 -s 
720x576 -aspect 4:3  -threads 0 -pass 1
set lcmdv2=    -vcodec libx264  -profile:v main  -b:v 350k -r:v 25 -s 
720x576 -aspect 4:3  -threads 0 -pass 2
set lcmda1=    -an
set lcmda2=    -acodec libvo_aacenc -ab 48k -ar 22050 -ac 1
ffmpeg -i video.vob  %lcmdv1% %lcmda1% -y test_h264_aac.flv
ffmpeg -i video.vob  %lcmdv2% %lcmda2% -y test_h264_aac.flv   2> test.log

second pass beginning
ffmpeg version N-48731-g7e5c5fa Copyright (c) 2000-2013 the FFmpeg 
developers
   built on Jan 10 2013 19:47:49 with gcc 4.7.2 (GCC)
   configuration: --enable-gpl --enable-version3 --disable-w32threads 
--enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r 
--enable-gnutls --enable-libass --enable-libbluray --enable-libcaca 
--enable-libfreetype --enable-libgsm --enable-libmp3lame 
--enable-libopencore-amrnb --enable-libopencore-amrwb 
--enable-libopenjpeg --enable-libopus --enable-librtmp 
--enable-libschroedinger --enable-libspeex --enable-libtheora 
--enable-libtwolame --enable-libvo-aacenc --enable-libvo-amrwbenc 
--enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxavs 
--enable-libxvid --enable-zlib --enable-filter=frei0r
   libavutil      52. 13.100 / 52. 13.100
   libavcodec     54. 86.100 / 54. 86.100
   libavformat    54. 59.107 / 54. 59.107
   libavdevice    54.  3.102 / 54.  3.102
   libavfilter     3. 32.100 /  3. 32.100
   libswscale      2.  1.103 /  2.  1.103
   libswresample   0. 17.102 /  0. 17.102
   libpostproc    52.  2.100 / 52.  2.100
[mpeg @ 024c80c0] max_analyze_duration 5000000 reached at 5000000
Input #0, mpeg, from 'video.vob':
   Duration: 00:00:02.50, start: 0.340078, bitrate: 46651 kb/s
     Stream #0:0[0x1e0]: Video: mpeg2video (Main), yuv420p, 720x576 [SAR 
16:15 DAR 4:3], 25 fps, 25 tbr, 90k tbn, 50 tbc
     Stream #0:1[0x80]: Audio: ac3, 48000 Hz, stereo, fltp, 256 kb/s
[libx264 @ 0289f980] using SAR=16/15
[libx264 @ 0289f980] using cpu capabilities: MMX2 Cache64
[libx264 @ 0289f980] profile Main, level 3.0
[libx264 @ 0289f980] 264 - core 129 r2230 1cffe9f - H.264/MPEG-4 AVC 
codec - Copyleft 2003-2012 - http://www.videolan.org/x264.html - 
options: cabac=1 ref=3 deblock=1:0:0 analyse=0x1:0x111 me=hex subme=7 
psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1 
8x8dct=0 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=1 
lookahead_threads=1 sliced_threads=0 nr=0 decimate=1 interlaced=0 
bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1 
b_bias=0 direct=1 weightb=1 open_gop=0 weightp=2 keyint=250 
keyint_min=25 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=2pass 
mbtree=1 bitrate=350 ratetol=1.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 
cplxblur=20.0 qblur=0.5 ip_ratio=1.40 aq=1:1.00
Output #0, flv, to 'test_h264_aac.flv':
   Metadata:
     encoder         : Lavf54.59.107
     Stream #0:0: Video: h264 ([7][0][0][0] / 0x0007), yuv420p, 720x576 
[SAR 16:15 DAR 4:3], q=-1--1, pass 2, 350 kb/s, 1k tbn, 25 tbc
     Stream #0:1: Audio: aac ([10][0][0][0] / 0x000A), 22050 Hz, mono, 
s16, 48 kb/s
Stream mapping:
   Stream #0:0 -> #0:0 (mpeg2video -> libx264)
   Stream #0:1 -> #0:1 (ac3 -> libvo_aacenc)
Press [q] to stop, [?] for help
[mpeg2video @ 024c86e0] warning: first frame is no keyframe
frame=    7 fps=0.0 q=30.0 size=       0kB time=00:00:00.04 bitrate=  
80.8kbits/s
frame=    9 fps=8.0 q=30.0 size=       0kB time=00:00:00.12 bitrate=  
26.9kbits/s
frame=   10 fps=5.1 q=30.0 size=      28kB time=00:00:00.16 
bitrate=1457.5kbits/s
frame=   13 fps=4.9 q=30.0 size=      28kB time=00:00:00.28 bitrate= 
832.8kbits/s

second pass ending

frame=  784 fps=3.2 q=30.0 size=    1548kB time=00:00:31.12 bitrate= 
407.5kbits/s
frame=  786 fps=3.2 q=31.0 size=    1548kB time=00:00:31.20 bitrate= 
406.5kbits/s
frame=  787 fps=3.2 q=31.0 size=    1553kB time=00:00:31.24 bitrate= 
407.2kbits/s
frame=  790 fps=3.2 q=31.0 size=    1553kB time=00:00:31.36 bitrate= 
405.8kbits/s
frame=  791 fps=3.2 q=31.0 size=    1562kB time=00:00:31.40 bitrate= 
407.5kbits/s
Incomplete MB-tree stats file.
Video encoding failed


of course the test case is an small file which starts not on keyframe 
but same problem
occurs on every input files I have used to test (small , large , vob or flv)

am I doing a mistake ?

thanks

jacky