[MPlayer-users] maybe a bug in mpeg1video output (a/v async in latter processing)?

[Thorsten W. Schmidt]

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hello

i use the following system:
- - suse 8.2 with kde 3.2.2
- - hauppauge wintv with bt878
- - kernel 2.4.20
- - libc 2.3.2
- - gcc 3.3
- - ld 2.13.90.0.18
- - GNU assembler 2.13.90.0.18

cpu (amd xp 2600+ with fsb down clocked to 111MHz:
processor       : 0
vendor_id       : AuthenticAMD
cpu family      : 6
model           : 6
model name      : AMD Athlon(tm) Processor
stepping        : 2
cpu MHz         : 1393.989
cache size      : 256 KB
fdiv_bug        : no
hlt_bug         : no
f00f_bug        : no
coma_bug        : no
fpu             : yes
fpu_exception   : yes
cpuid level     : 1
wp              : yes
flags           : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca 
cmov pat pse36 mmx fxsr sse syscall mmxext 3dnowext 3dnow
bogomips        : 2778.72

capture card (lspci):
00:0b.0 Multimedia video controller: Brooktree Corporation Bt878 Video Capture 
(rev 02)
00:0b.1 Multimedia controller: Brooktree Corporation Bt878 Audio Capture (rev 
02)

and software:
- - mplayer 1.0pre4-3.3
- - mjpegtools-1.6.2-1 (used tool: mplex)
- - mpgtx-1.3-2 (used tool: mpgdemux)
- - dvdauthor-0.6.9

- -----------------------------------------
to record video from my hauppauge i use the following command line. the cpu is 
at about 55%. i also recorded with low resolution (cpu at 20%), but the 
result is the same. also tried to do it as root with "nice -n -20" with the 
same result. here the commandline:
"mencoder -srate 48000 tv://R6 -tv 
driver=v4l:alsa:volume=65535:width=720:height=576:audiorate=48000 -vf pp=fd 
- -ovc lavc -lavcopts 
vcodec=mpeg1video:vbitrate=1000:keyint=25:abitrate=224:acodec=mp2:aspect=4/3 
- -oac lavc -of mpeg -o /backup/test.mpg"

while recording i frequently (about 150 per hour) get:
"Unknown block type, possibly non-MPEG stream!"
it looks like each line stands for a single droped frame. also mplayer reports 
while recording
"Pos:3600,0s 89877f (0%) 25fps Trem:   0min   0mb  A-V:0,000 [999:224]". so it 
seems mplayer droped 123 frames in one hour. is it possible to duplicate the 
last frame if the current one was droped?

the output is a working mpeg stream. everything seems to be fine. but 
dvdauthor doesn't recognize it as a valid mpge1 stream. dvdauthor reports:

"STAT: Processing test.mpg...
WARN: Skipping sector, waiting for first VOBU...
WARN: Skipping sector, waiting for first VOBU...
...
WARN: Skipping sector, waiting for first VOBU...
WARN: Skipping sector, waiting for first VOBU...
WARN: Skipping sector, waiting for first VOBU...
ERR:  SCR moves backwards, remultiplex input."
- -----------------------------------------
so i tried to demux and remux the output of mplayer with:
"mpgdemux -X -P -N -b chunk -f test.mpg"
"mplex -f 8 -o test2.mpg chunk-0.m1v chunk-0.mp2"

this file is working with dvdauthor (no error), but audio and video are not 
synchron anymore. when i record a 30 minutes piece, the difference is about 3 
seconds in the end. when i record 90 minutes the difference is about 8 
seconds in the end.

greetings
  thorsten
- -- 
+-----------------------------------------------------------------------
| Dipl.-Inform. Thorsten W. SCHMIDT
| Lehrstuhl Angewandte Informatik III (Robotik und Eingebettete Systeme)
| Universitaet Bayreuth, D-95440 Bayreuth, Germany
| Tel: +49 (0)921-55-5163, Fax: +49 (0)921-55-5162
| eMail: Thorsten.W.Schmidt at uni-bayreuth.de or t_w_s at web.de
| Http://ai3.inf.uni-bayreuth.de or http://www.tws-home.de
+-----------------------------------------------------------------------
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