[linux-dvb] Mencoder, no-go muxes and picture aspect

Simon Baxter linuxtv at nzbaxters.com
Thu Apr 28 12:08:01 CEST 2005


Hi group

I've been using mplayer's Mencoder to encode streams from my WinTV NovaT 
card on the fly, with varied results.  I start a tzap to tune the card, then 
mencode it.

1) Some muxes don't seem to lock.  With Mux 1 off UK-Crystal Palace (which 
works fine) I get :
MEncoder 1.0pre6-3.4.2 (C) 2000-2004 MPlayer Team
CPU: Advanced Micro Devices Athlon MP/XP/XP-M Barton (Family: 6, Stepping: 
0)
Detected cache-line size is 64 bytes
CPUflags: Type: 6 MMX: 1 MMX2: 1 3DNow: 1 3DNow2: 1 SSE: 1 SSE2: 0
Compiled with runtime CPU detection - WARNING - this is not optimal!
To get best performance, recompile MPlayer 
with --disable-runtime-cpudetection.        #I'll get around to fixing this 
:)
File not found: 'frameno.avi'
Failed to open frameno.avi
success: format: 0  data: 0x0 - 0x0
TS file format detected.
DEMUX OPEN, AUDIO_ID: -1, VIDEO_ID: -1, SUBTITLE_ID: -1,
PROBING UP TO 2000000, PROG: 0
etc
etc

But mux 3 (channel five etc) I get :
MEncoder 1.0pre6-3.4.2 (C) 2000-2004 MPlayer Team
CPU: Advanced Micro Devices Athlon MP/XP/XP-M Barton (Family: 6, Stepping: 
0)
Detected cache-line size is 64 bytes
CPUflags: Type: 6 MMX: 1 MMX2: 1 3DNow: 1 3DNow2: 1 SSE: 1 SSE2: 0
Compiled with runtime CPU detection - WARNING - this is not optimal!
To get best performance, recompile MPlayer 
with --disable-runtime-cpudetection.
File not found: 'frameno.avi'
Failed to open frameno.avi
success: format: 0  data: 0x0 - 0x0

...and nothing further.  No "TS file format detected", no avi created, no 
nothing!!

How come?


2)  Has anyone had any luck changing the aspect with Mencoder?  The avi is 
too vertically stretched.  I had tried the following
mencoder /dev/dvb/adapter0/dvr0 -force-avi-aspect 3.0 -ovc lavc -lavcopts 
vcodec=mpeg4:vpass=1 -oac copy -o /usr/video/Test25-9_2_280405.avi

...with many different aspect values - but it doesn't seem to have any 
effect



any ideas?

Cheers

Simon 





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