Is it possible to use any of these transcoders to resize mpeg files for CD? job, possible, another, created

andy

I saw this quesiton on another board:
quot;Is it possible to resize MPEG files to fit on a CDquot;, the answer is YES, and there are many ways.

But, I got curious and tried to use DVD2One to do this. Transcoding is quicker and DVD2one does a good job, maybe....

I tried to rename a large mpeg file to a vob. Then I tired to create and IFO file for the vob file. I also tried to copy a ifo file from a dvd that was created from the same source file.

These source files are not DVD files, they are files extracted from a ReplayTV. 720x480 (or 352x480 in lower quality modes) MPEG2 files with 48Khz audio. Files are between 7-800MB when commericals are edited out. The transcode won't need to do much, just something.

I've used DVD2one to create a DVD from an MPEG that was 4.9GB and it worked great. But what about CD?
Is there any tool which would take a regular MPEG and transcode it to a user supplied size? Or are there any ideas on how to creatively do this with any of the standard transcoders?

back when DVD2ONE first came out, I begged for it to be able to transcode a straight MPEG2 Program stream (ie, audio/video) without messing with the IFO/VOB structure...

no one ever responded (either here or on the DVD2One board) so I have to assumed it was ignored.

why not author your mpg file with for example dvd workshop from Ulead just load the mpg and produce a vob and ifo's. These you load in IC7 and set the slider to the size you want. will give you a new set of vob with desired size, convert this to mpg, there are sure standard tools for this last step (simple rename vob in to mpg is not enough). Probably you have to demux audio and video from vob and mux them again

cause that's about 6 steps MORE than necessary, if someone would think past the IFO. Let's say I have a multi program disc OF THINGS I AM RECORDING. One program is just a little too big (not much, say 10%). Now either I have to...

author the entire disc with the ovesized files,
then shrink them ALL down

or (what you suggested) author one program
shrink it down
extract the audio/video
turn it back into a MPEG stream
author what I wanted to begin with with the other programs

wouldn't it be much easier to

shrink the streams I want to first
then make the ONE author pass I want to, leaving everything else
at the normal quality???

yep your method sounds easier however the charm of the IC7 and similar transoder programs is that they do not full re-encode and as such are faster, there is the gain compared with conventional encoders which take their time to re-encode an mpg to lower bitrate. The problem of this transcoder programs is that they only accept vob's as input as far as I know. If they would accept mpg2 files for example life would be easy.

We want the simple Transcode tool for mpeg, we don't want to reencode everything.

The problem with creating a DVD first is that eveything is combined into vob files. These VOBs are split on 1GB filesize boundries, and not on program boundries. This makes it difficult to move segments around.

Some of us aren't ripping DVDs. We've got other sources, replayTV, mpeg captures on HTPCs, you name it there are lots of sources for MPEG files.

Transcoding of MPEG files should be very simple because of the following:
1) Same as VOB yet more simple. One MPEG video stream, one audio stream.
2) No need to patch IFO files
3) No need to select extras
4) No need to select audio streams

The parts to this tool already exist, that I'm sure of. It may just be that they need to be repackaged into a new app. A command line tool would be great.

resizempg infile outfile newsize
I could deal with that.

=)

I don't believe IC7 or DVD2one does anything with the audio streams. There doesn't seem to be any reason to.

Originally posted by jippiejajee
yep your method sounds easier however the charm of the IC7 and similar transoder programs is that they do not full re-encode and as such are faster, there is the gain compared with conventional encoders which take their time to re-encode an mpg to lower bitrate. The problem of this transcoder programs is that they only accept vob's as input as far as I know. If they would accept mpg2 files for example life would be easy.

a VOB is nothing but a MPEG2 stream with a (slightly) differnt MUX, some extra navigation pointers and a different name. The I/B/P frames are IDENTICAL and a 'standalone' transcoding utility would be simplicity. I don't know why neither the DVD2One or DVD95COPY people continue to ignore this request. As someone already pointed out, all the code exists, all the IFO modification code is not needed. It would be a pice of cake to add this funtionality.

Anyone got public source of the transcoding?

I'd do the work if I had any clue as to how these apps work...

I'd also like to know if it IS really different to operate on an MPEG PS vs DVD VOB file. From what I know about MPEG2 and VOB files is can't be more difficult.

Seems like there are only three of use looking for a tool too. Unless I send AVSForum members over here. I speak for a lot of replayTV users that would love a to see a tool that can do this. =)

Has there been any advance on this? It WOULD be an incredibly helpful tool, especially for hardware-based encoders.

Wow, what a fantastic idea!

But god knows what an 5gig file would look like if it was made into a 700MB file!

It is a real shame that dvd2one does'nt work with raw .vob or Mpeg2 (ie files without IFO's)

Damm those .vob containers!

I am not sure, but when you look in the quot;Aboutquot; box in IC7, you see the quot;VOB MPEG2 Video Transcoderquot;, which points to a directory. In that directory there is a quot;vobtrans.axquot; file... Perhaps you can interface that somehow? I am not a programmer, so don't ask me...

cu, Aragorn

Hell, I'd like to see what a 5GB file looks like at 4.2GB. That's all I really need.

The .ax file is a directshow filter. Not sure how that is/could be used.

I wish someone would describe the transcode process (with details, I understand MPEG compression, file format, etc.), I've asked DVDShrink and the author of DVD2One, but both didn't answer.