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

Simon Baxter linuxtv at nzbaxters.com
Thu Apr 28 13:29:26 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.
>
>
>
> why don't you use directly
>
> $ mencoder dvb:// ...
>
> instead?

...snip
Not sure how to get this working :
[file] No filename
Failed to open dvb://
Cannot open file/device.


>> ...and nothing further.  No "TS file format detected", no avi created, no 
>> nothing!!
>>
>> How come?
>
>
> nothing is coming out of the card.  Maybe the card isn't locking the 
> frequency

It looks ok :
[root at media ~]# /root/bin/tzap -c /root/.tzap/channels.conf -r 'five'
using '/dev/dvb/adapter0/frontend0' and '/dev/dvb/adapter0/demux0'
tuning to 561833330 Hz
video pid 0x0000, audio pid 0x0caa
status 01 | signal 3838 | snr f763 | ber 0000089c | unc 00000000 |
status 01 | signal 3939 | snr f763 | ber 0000089c | unc 00000000 |
status 1f | signal 3a3a | snr ffd6 | ber 00000029 | unc 00000000 | 
FE_HAS_LOCK
status 1f | signal 3939 | snr ffff | ber 00000000 | unc 0000000b | 
FE_HAS_LOCK
status 1f | signal 3939 | snr ffff | ber 00000000 | unc 00000000 | 
FE_HAS_LOCK


>> 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
>
> what does mplayer say when you play it? 3.0 is allowed but a bit strange, 
> though

hmm, not sure.  Am recording samples on the linux box and watching them on 
Windows Media Player Classic.

Another weird thing, even though I'm "-force-avi-aspect 3.0", I'm getting 
the following :
[root at media video]#file Test_asp3_280405.avi
Test_asp3_280405.avi: RIFF (little-endian) data, AVI, 704 x 576, 25.00 fps, 
video: DivX 4, audio: (stereo, 48000 Hz)

And, "-force-avi-aspect 2.0", I'm getting the following :
[root at media video]# file Test_asp2_280405.avi
Test_asp2_280405.avi: RIFF (little-endian) data, AVI, 704 x 576, 25.00 fps, 
video: DivX 4, audio: (stereo, 48000 Hz)

Should the resolutions be the same with a different aspects?






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