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5 ...better than nothing but perhaps there should be a label for "open-source", linux is not really equivalent to FOSS etc...
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4 Added new infomation
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Background:

I am trying to compress lossless bluray tracks to a more storage friendly size without a huge loss in quality.

What I've been doing thus far:

Exploring compression options with ffmpeg. Mainly around h264 with the -crf argument.

Restrictions:

Linux and open source tools. Please don't suggest anything Apple/Microsoft specific.

Question:

Most of the options I see around compression involved bit rates or fixed output sizes. I am looking for a video codec that has more of a "quality threshold". I don't mind if more complex portions of the track require more bytes to deliver the same level of visual quality. Does anything like this exist?

Edit:

I am having good luck with the -qscale argument and libxvid. If I don't get any other suggestions, I'll just go with that.

Background:

I am trying to compress lossless bluray tracks to a more storage friendly size without a huge loss in quality.

What I've been doing thus far:

Exploring compression options with ffmpeg. Mainly around h264 with the -crf argument.

Restrictions:

Linux and open source tools. Please don't suggest anything Apple/Microsoft specific.

Question:

Most of the options I see around compression involved bit rates or fixed output sizes. I am looking for a video codec that has more of a "quality threshold". I don't mind if more complex portions of the track require more bytes to deliver the same level of visual quality. Does anything like this exist?

Background:

I am trying to compress lossless bluray tracks to a more storage friendly size without a huge loss in quality.

What I've been doing thus far:

Exploring compression options with ffmpeg. Mainly around h264 with the -crf argument.

Restrictions:

Linux and open source tools. Please don't suggest anything Apple/Microsoft specific.

Question:

Most of the options I see around compression involved bit rates or fixed output sizes. I am looking for a video codec that has more of a "quality threshold". I don't mind if more complex portions of the track require more bytes to deliver the same level of visual quality. Does anything like this exist?

Edit:

I am having good luck with the -qscale argument and libxvid. If I don't get any other suggestions, I'll just go with that.

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3 edited headline to match the question
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Adaptive quality codec What video codecs can provide "adaptive quality"?

2 Subtly altered the question so that it's not a "give me a list of X" type of question.
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