[MPlayer-users] convert (S)VCD's to VDR files using MEncoder

[Nico]

Michael Reinelt wrote:

> Hi List,
>
> I have some questions regarding MEncoder:

> If I have a SVCD which is already PAL, I'm using this command:
> mencoder vcd://1 -ovc copy -oac copy -of mpeg -o 001.vdr


VDR files are interleaved PES: a non-standard stuff made of mpeg-ps 
without Pack headers.
mencoder generates mpeg-ps files with headers, so not what you want.
I  think that VDR doesn't usually play those files, but maybe it evolved

>
> Q1: is the command correct? should I specify any additional option?
>
> Q2: Why are there always two tracks on the VCD, the first one being 
> quite short, and sometimes leads to a hanging MEncoder? I have to use 
> vcd://2 then. Can I always use vcd://2?
>
> If I process one of these NTSC SVCD's, I'm using this command: (all in 
> one line)
> mencoder vcd://1 -ovc lavc -oac copy -lavcopts 
> vcodec=mpeg2video:vbitrate=2500 -vf scale=480:576 -of mpeg -ofps 25 -o 
> 001.vdr
>
> The original video has 480x480 pixel, and 29,97 fps. I have to correct 
> both of them (do I have to correct both of them?)
>
> Q3: is the command correct? should I specify any additional option?

:mbd=2 or at least :vhq and :aspect=4/3

> Q3b: what vbitrate would you suggest? Is 2500 far too low or far too 
> high?
>
only  your preferences and some testing can help you

> Q4: I want to make a script for these commands, which would fake the 
> necessary VDR directory structure, and would generate the VDR index 
> file afterwards. But as there are two different commands for NTSC and 
> PAL, is there a way to detect the format of the SVCD?
>
> Q5: during processing, I regularly get the following messages:
> "1 duplicate frame(s)!"
> "Unknown block type, possibly non-MPEG stream!"
> "Skipping frame!"
> What do they mean? should I worry about them, or just ignor'em?
>
> Q6: when I try to run above commands directly on my server, which has 
> an SCSI CD drive, I get really very lots of messages from the kernel:
> Feb  8 14:15:55 lizard kernel: sr1: CDROM (ioctl) reports ILLEGAL 
> REQUEST.
> Feb  8 14:16:26 lizard last message repeated 4140 times
> Feb  8 14:17:27 lizard last message repeated 8154 times
> Feb  8 14:18:28 lizard last message repeated 8208 times
> Feb  8 14:19:29 lizard last message repeated 7653 times
> Feb  8 14:20:08 lizard last message repeated 4880 times
> They flood my syslogd, and put a quite high load on the machine, which 
> slows down the mencoder process a lot.
> I'd like to do this porocessing oin the server, because the resulting 
> files won't go over the lan. What can I do?
>
>
> Any help would be greatly appreciated!
>
> If someone is interested in the resulting VDR scripts, let me know!
>
>
> bye, Michael
>