I use the following steps to repeat the bug. 1.Download FFMpeg-20050508.tar.bz2 (the latest cvs) 2.Compile it with cygwin 1.5.13. 3.Run it with the following log (c:\a.asf is 01:02:11 time length, and mplayer can player it and seek it well): ------------ C:\>c:\ffmpeg.exe -ss 00:10:00 -t 00:30:00 -y -i c:\a.asf -bitexact -vcodec xvid -s 320x240 -r 15 -b 190 -acodec amr_nb -ac 1 -ar 8000 -ab 12 -f 3gp c:\byffmpeg .3gp ffmpeg version 0.4.9-pre1, build 4754, Copyright (c) 2000-2004 Fabrice Bellard configuration: --enable-mp3lame --enable-faac --enable-faad --enable-amr_nb - -disable-ffserver --disable-ffplay --enable-small --enable-memalign-hack --enabl e-gpl --enable-xvid --enable-dts --enable-a52 --disable-vhook built on May 8 2005 21:27:05, gcc: 3.3.3 (cygwin special) [asf @ 0x66df18]read_seek: 1 603100 [asf @ 0x66df18]ff asf bad header 31 at:119389534 [asf @ 0x66df18]seek failed [asf @ 0x66df18]ff asf bad header 31 at:119389534 [asf @ 0x66df18]seek failed [asf @ 0x66df18]ff asf bad header 3 at:119386334 [asf @ 0x66df18]ff asf skip 3184 124 [asf @ 0x66df18]ff asf bad header 31 at:119389534 [asf @ 0x66df18]seek failed [asf @ 0x66df18]ff asf bad header d0 at:119379934 [asf @ 0x66df18]ff asf bad header 0 at:119383134 [asf @ 0x66df18]ff asf skip -23342 0 [asf @ 0x66df18]ff asf bad header 3 at:119386334 [asf @ 0x66df18]ff asf skip 3184 124 [asf @ 0x66df18]ff asf bad header 31 at:119389534 [asf @ 0x66df18]seek failed [asf @ 0x66df18]ff asf bad header 90 at:119367134 [asf @ 0x66df18]ff asf skip 3138 0 [asf @ 0x66df18]ff asf bad header 40 at:119370334 [asf @ 0x66df18]ff asf bad header 0 at:119373534 [asf @ 0x66df18]ff asf skip -7365 0 [asf @ 0x66df18]ff asf bad header 3 at:119376734 [asf @ 0x66df18]ff asf skip 3185 62 [asf @ 0x66df18]ff asf bad header d0 at:119379934 [asf @ 0x66df18]ff asf bad header 0 at:119383134 [asf @ 0x66df18]ff asf skip -23342 0 [asf @ 0x66df18]ff asf bad header 3 at:119386334 [asf @ 0x66df18]ff asf skip 3184 124 [asf @ 0x66df18]ff asf bad header 31 at:119389534 [asf @ 0x66df18]seek failed [asf @ 0x66df18]ff asf parser skips: 0 - 1010 o:971 - 0 60 0 fl:39 [asf @ 0x66df18]ff asf parser skipping 39b [asf @ 0x66df18]ff asf bad header 90 at:119367134 [asf @ 0x66df18]ff asf skip 3138 0 [asf @ 0x66df18]ff asf bad header 40 at:119370334 [asf @ 0x66df18]ff asf bad header 0 at:119373534 [asf @ 0x66df18]ff asf skip -7365 0 [asf @ 0x66df18]ff asf bad header 3 at:119376734 [asf @ 0x66df18]ff asf skip 3185 62 [asf @ 0x66df18]ff asf bad header d0 at:119379934 [asf @ 0x66df18]ff asf bad header 0 at:119383134 [asf @ 0x66df18]ff asf skip -23342 0 [asf @ 0x66df18]ff asf bad header 3 at:119386334 [asf @ 0x66df18]ff asf skip 3184 124 [asf @ 0x66df18]ff asf bad header 31 at:119389534 [asf @ 0x66df18]seek failed [asf @ 0x66df18]pos_min=0x2dd pos_max=0x71cdc5d dts_min=3 dts_max=3732 [asf @ 0x66df18]ff asf parser skips: 0 - 1010 o:971 - 0 60 0 fl:39 [asf @ 0x66df18]ff asf parser skipping 39b [asf @ 0x66df18]733 0 119331933 / 0 119331933 0 target:3 limit:0 start:3732 noc: 0 [asf @ 0x66df18]ff asf parser skips: 0 - 1010 o:971 - 0 60 0 fl:39 [asf @ 0x66df18]ff asf parser skipping 39b [asf @ 0x66df18]ff asf bad header 90 at:119367134 [asf @ 0x66df18]ff asf skip 3138 0 [asf @ 0x66df18]ff asf bad header 40 at:119370334 [asf @ 0x66df18]ff asf bad header 0 at:119373534 [asf @ 0x66df18]ff asf skip -7365 0 [asf @ 0x66df18]ff asf bad header 3 at:119376734 [asf @ 0x66df18]ff asf skip 3185 62 [asf @ 0x66df18]ff asf bad header d0 at:119379934 [asf @ 0x66df18]ff asf bad header 0 at:119383134 [asf @ 0x66df18]ff asf skip -23342 0 [asf @ 0x66df18]ff asf bad header 3 at:119386334 [asf @ 0x66df18]ff asf skip 3184 124 [asf @ 0x66df18]ff asf bad header 31 at:119389534 [asf @ 0x66df18]seek failed [asf @ 0x66df18]pos=0x71cdc5d 3732<=603100<=-9223372036854775808 Seems that stream 1 comes from film source: 1000.00 (1000/1) -> 30.00 (30/1) Input #0, asf, from 'c:\a.asf': Duration: 01:02:08.3, start: 3.100000, bitrate: 256 kb/s Stream #0.0: Audio: wmav2, 22050 Hz, stereo, 32 kb/s Stream #0.1: Video: msmpeg4, yuv420p, 320x240, 1000.00 fps Output #0, 3gp, to 'c:\byffmpeg.3gp': Stream #0.0: Video: xvid, yuv420p, 320x240, 15.00 fps, q=2-31, 190 kb/s Stream #0.1: Audio: amr_nb, 8000 Hz, mono, 12 kb/s Stream mapping: Stream #0.1 -> #0.0 Stream #0.0 -> #0.1 Press [q] to stop encoding [asf @ 0x66df18]ff asf parser skips: 0 - 1010 o:971 - 0 60 0 fl:39 [asf @ 0x66df18]ff asf parser skipping 39b [halt],cpu utilization is 100% ------------ If you want more info (eg. let me upload the c:\a.asf file),please let me know. I am happy to support it. Best Regards, Xie Bo