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Is there a way to convert a VOB to another video format using ffmpeg without sacrificing audio or video quality?

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i thought we covered this already with the previous questions relating to -vcodec copy and -sameq – hbdgaf Dec 31 '10 at 20:54
On that question I was asking about converting an MKV. I thought that things might be different for VOB files. – tony_sid Jan 1 '11 at 2:02

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Any time you do any form of format conversion you're likely to end up with some actual quality loss, though if done sensibly you won't be able to detect the quality loss. I do this all the time with tools like Handbrake.

To make life easier, ffmpeg comes with presets to allow you to easily set the options to minimise the detectable loss of quality. Were you to be encoding to x264 then you could use -vcodec libx264 -vpre lossless_medium for instance.

Your choices will depend on your desired destination format, and what tools you want to use.

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Surely, there's a way to losslessly stream copy+concatenate to MKVs? – JamesTheAwesomeDude Aug 12 at 16:16
MKV is a container, as is VOB. Neither are video formats. If you want to simply change container, yes. If you want to change codec/format, no. Changing container only works if the devices support the codecs but not the container. – Cry Havok Aug 15 at 10:25
Yes, I know that MKV is a container format. I also know that VOB is a container format. I did not imply that either one was a codec. In fact, I used the very words "stream copy" (lossless copying of a video stream from one compatible container to another) and "concatenate" (an operation that can be performed on certain codecs to concatenate video without re-encoding it). MKV supports every codec, and mpeg2 can be losslessly concatenated. – JamesTheAwesomeDude Aug 17 at 19:02
MKV supports all codecs, and mpeg2 can be losslessly concatenated, therefore, it's possible (there may not be any tools currently available to make it convenient, but it's possible) to rip a DVD to a ~4GB MKV with no re-encoding and therefore no video quality loss. Which I think is what @tony_sid was originally asking for (and what I was trying to find out how to do when I found this question). – JamesTheAwesomeDude Aug 17 at 19:05

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