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Old 01-09-2003, 12:18 AM   #1
UB_KMA
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Question MPG to VOB?


Well, I got ALL of my linux video processing needs licked, except being able to convert mpg format to dvd vob format, or, alternately a method to down-size mpg files (at a quality sacrifice, of course).

The goal: To be able to fit large svcd files onto one standard cdr.

What I have to do now, is (using transcode, avifile, and mpegtools) is to convert the mpg to a smaller avi, the size of which I can specify, and then back to vcd or svcd -- this takes a loooong time and there is guesswork involved in specifying the proper avi size that will then convert to the mpg size I need. I can convert vob files into vcd or svcd, and specify the exact size of the resulting mpg file, however the tools I currently use do not allow for the direct resizing of mpg files (you'd think that would be a simple operation, since vob is really just mpg -- and they allow size manipulation in vob to mpg).

So, if anyone knows a tool for downsizing mpg video files, or converting them to vob (or is brighter than I and knows how it can be done with the tools I mentioned above) let me know!

Thanks!
 
Old 01-09-2003, 12:31 AM   #2
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Ah, except, I can re-copy the mpg to a smaller file by reducing the video resolution, but there are so many variables that can reduce file-size that I'd hate to rely on simply reducing resolution!
 
Old 01-10-2003, 04:32 AM   #3
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Okay, changing the video bitrate shrinks the files further...if I get a transcode command line that works properly for fitting 2hr + movies on one cdr in SVCD format with good quality I wil post it (import file type will have to be modified of course per user, and a bitrate calculator tool will be required to match size with time to set the exact bitrate). While lowering bitrate doesn't affect the quality of a still frame, or a standard movie sequence, it can affect the quality of a fast action type sequence, making it appear a bit blocky and digital in areas. Probably a compromise between bitrate and resolution (always set resolution in increments of 16 b.t.w.) is the solution....
Again, any suggestions appriciated.
 
Old 01-10-2003, 04:36 AM   #4
acid_kewpie
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i'm not sure quite what you're trying to achieve, but have you seen mplayers mencvcd script? it might be useful for you, but i'm not sure. it's in mplayers TOOLS directory in the source download.
 
Old 01-10-2003, 05:50 AM   #5
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Thanks, I will check for that...

I understand I kinda was rambling, but the actual goal was to be able to fit a movie larger than 90 minutes onto one cdr in svcd or vcd format with viewable quality.

Experiments over the past two days have revealed this:

If anyone else has the desire to fit large movie files onto a single cdr that can be viewed in a stand-alone player, the solution is to go with vcd, not svcd, and set the option -F 2 in transcode, then set the option -w (which is video bitrate) to a value (in multiples of 16) to no less than 592 (-w 592) for accceptable quality -- experiment to see what is acceptable to you..

Also, an invaluable tool to help achieve this is KAvi2svcd -- see it on freshmeat. It allows you to make limited global settings for video transcoding via a gui, and then prints the transcode command line in an area where you can modify it for fine tuning. Although probably not the software's actual intent, you can use it to help you do anything that transcode is capable of.

Some other programs of helpful note:
VCDlin
DVD::rip
And last, but not least, AcidRip
 
  


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