[FFmpeg-user] question about "Buffering several frames is not supported. Please consume all available frames before adding a new one."

[littlebat]

Hi,

I tried to get an avi snippet from a rmvb movie using ffmpeg, this is my
command line: ffmpeg -i yyzs.rmvb -ss 02:40:00 -t 00:10:00 yyzs17.avi
But, it spend about 10 minutes on the part before intended snippet and
encode zero frame, the last 1 minutes it worked on that snippet. The
key message is: "Buffering several frames is not supported. Please
consume all available frames before adding a new one."

I tried encoding rmvb to avi, rmvb to mp4, mp4 to mp4, mp4 to avi, got
the same result.

Is it normal? or need add special parameters to avoid
wasteing unnecessary time on unintended part?

ffmpeg compiled from newest git repository: FFmpeg version
git-N-28755-g7ac1674

Below is the detail(break the long time running and omitted some
repeat messages):

 mdx at u1004b2-desktop:/media/1217e/mdx/share/rwshare/yyzs$
ffmpeg -i yyzs.rmvb -ss 02:40:00 -t 00:10:00 yyzs17.ffmpeg.refresh.avi
FFmpeg version git-N-28755-g7ac1674, Copyright (c) 2000-2011 the FFmpeg
developers built on Apr  1 2011 15:36:56 with gcc 4.4.3 configuration: 
  libavutil    50. 40. 0 / 50. 40. 0
  libavcodec   52.116. 0 / 52.116. 0
  libavformat  52.104. 0 / 52.104. 0
  libavdevice  52.  4. 0 / 52.  4. 0
  libavfilter   1. 76. 0 /  1. 76. 0
  libswscale    0. 13. 0 /  0. 13. 0
[NULL @ 0xa9f3010] Unsupported video codec
[rm @ 0xa9ea600] max_analyze_duration reached
Input #0, rm, from 'yyzs.rmvb':
  Metadata:
    title           : 
    author          : 
    copyright       : 
    comment         : 
  Duration: 02:45:12.13, start: 0.000000, bitrate: 608 kb/s
    Stream #0.0: Video: rv40, yuv420p, 640x360, 531 kb/s, 12.05 fps, 12
tbr, 1k tbn, 12 tbc Stream #0.1: Audio: cook, 44100 Hz, stereo, s16, 64
kb/s Stream #0.2: Data: [0][0][0][0] / 0x0000
[buffer @ 0xaa76500] w:640 h:360 pixfmt:yuv420p
Output #0, avi, to 'yyzs17.ffmpeg.refresh.avi':
  Metadata:
    INAM            : 
    author          : 
    ICOP            : 
    ICMT            : 
    ISFT            : Lavf52.104.0
    Stream #0.0: Video: mpeg4, yuv420p, 640x360, q=2-31, 200 kb/s, 12
tbn, 12 tbc Stream #0.1: Audio: mp2, 44100 Hz, stereo, s16, 64 kb/s
Stream mapping:
  Stream #0.0 -> #0.0
  Stream #0.1 -> #0.1
Press [q] to stop encoding
[buffer @ 0xaa76500] Buffering several frames is not supported. Please
consume all available frames before adding a new one. frame=    0 fps=
0 q=0.0 size=      10kB time=10000000000.00 bitrate=   0.0kbit
frame=    0 fps=  0 q=0.0 size=      10kB time=10000000000.00
bitrate=   0.0kbit frame=    0 fps=  0 q=0.0 size=      10kB
time=10000000000.00 bitrate=   0.0kbit frame=    0 fps=  0 q=0.0
size=      10kB time=10000000000.00 bitrate=   0.0kbit frame=    0
fps=  0 q=0.0 size=      10kB time=10000000000.00 bitrate=
0.0kbit ...(omitted) frame=    0 fps=  0 q=0.0 size=      10kB
time=10000000000.00 bitrate=   0.0kbit    Last message repeated 45778
times Buffering several frames is not supported. Please consume all
available frames before adding a new one. [buffer @ 0xaa76500]
Buffering several frames is not supported. Please consume all available
frames before adding a new one.

thanks.

littlebat