Picture Quality using compression

[denret]

This may come as a rather redundant question, but I'll ask anyway:

When Dvd9 or Dvd5 compression is used during Blu ray copy, how much does this affect the quality of the 1080 picture?

[signals]

It does naturally to some degree, there is no free lunch (assuming you're asking about BD-9 or BD-5). But it still looks very good, in most cases better than an original DVD. This is subjective, so try a couple and see. It is somewhat less effective for movies with lots of fast action or panning. To maximize video quality, always delete HD audio.

[denret]

Compression

Yes, I was referring to BD9 and BD5. Considering the amount of compression required, the results are still pretty impressive. Thanks for the tip on the HD Audio.

[kelson]

This may come as a rather redundant question, but I'll ask anyway:

When Dvd9 or Dvd5 compression is used during Blu ray copy, how much does this affect the quality of the 1080 picture?

Entirely, entirely subjective. In a technical sense, if you take a 30GB BD title and lower the bitrate by a whopping 70% to fit it on a DVD-9 you will degrade the original image quality very substantially -- there can be no argument about that, you are starving it for bitrate.

However, most people do not view a compressed vs. uncompressed picture side-by-side but rather in isolation. So, whether or not you actually notice you are viewing a degraded picture depends on the quality and size of your display, your viewing distance and orientation wrt the plane of the display and the state of your vision. You will just have to try it and make that decision for yourself.

The same goes for HD audio. Unless you have more than a run-of-the-mill "HT in a box", not only will you not hear the difference between DTS-MA and DTS, but you probably won't hear the difference between them and the DD AC3/5.1 audio track, if it is available. Selecting AC3 vs. DTS saves a lot of space that could be used for video bitrate. Again it's up to you to decide if you can hear the difference on your equipment.