Leawo's one of few companies providing software to do more than convert the video on a Blu--ray disc to something else. Leawo Blu-ray Creator works, but there are caveats to creating your own Blu-ray video discs. I don't want to talk you out of getting Leawo's software today, but there are several factors to making Blu-ray video discs themselves that may be deal breakers for some people. I do think folks should go into it with eyes open, aware of the potential pitfalls to avoid wasting time & money.

You are not going to make something like the retail discs you buy or rent without spending thousands on software that creates the special Java code that they use -- instead you'll create discs that look & work like DVDs but at Blu-ray's higher resolutions. That means that there are no "more pro" apps to recommend.

Depending on your hardware, you *may* find some apps that are faster encoding 1080p AVC, but that's going to be iffy... I'm running a PC set up for video encoding with an i7 & a AMD graphics card with OpenCL, & after Much fiddling with the app's encoding settings, I can encode in Nero Plat. with *slightly* faster times than any other encoder I can find to try, but it's not a great user experience, & I think reviews calling Nero bloatware are justified. It also is more limited in the formats it'll import & use.

Blu-ray burners are more expensive -- ~$50+ vs. <$20 for a DVD burner -- & they may not last more than just over a year. The blank discs are more expensive -- the cheapest I've seen single layer are ~$15 for 50, while it's hard to find dual layer for less than $2 per disc. Blu-ray blanks are more fragile than DVDs, often with a soft vs. hard coating on the writing surface, & many brands will not last more than months before you start getting read errors. Both DVD & Blu-ray players can have compatibility issues with the brand of blank discs & the brand & model of burner that was used, but Blu-ray players are much worse in this respect. There's an AVCHD format that's almost identical to the official Blu-ray spec, many [most?] players will recognize discs you burn as AVCHD rather than Blu-ray, & not every player will play them. Note that for compatibility you *may* need to burn discs at slower speeds than the rated max.

That said, with video encoding there are 2 things that influence quality more than any other: the frame size & the amount of video compression. Other than BitTorrent, Blu-ray is the only way to relatively cheaply distribute 1080p video files that are 25-50GB -- the video bit rate is often ~30 vs. *maybe* 3-4 for streaming or cable TV. And while it's more of a niche thing, the Blu-ray spec does include DVD discs, so you can put AVC video on a cheap DVD blank, getting much better quality than DVD's mpg2, with a disc that's playable in many [most?] Blu-ray players.

Video encoding for Blu-ray **may** be an issue... The Blu-ray spec includes AVC [the most popular format by far], VC1 [think Windows Media], & mpg2. But as with DVDs, the details of the spec are secret -- you have to pay a bunch of money & sign a NDA -- so it's hard to know if your video will be in spec, & maybe near impossible to know if it will play on every player out there. I think most of the time you're fine, but I wouldn't invest a lot of time, or effort, or money without running a test or two to make sure a Blu-ray disc you burn will play where you want/need it to.

Encoding quality 1080p AVC video for Blu-ray is CPU intensive & takes a relatively long time -- on a PC with a i7 CPU you're doing well if you can manage 2 hours worth of video in somewhere around 2 hours, but mostly it'll take [sometimes much] longer than that. For that reason several apps use mpg2 for Blu-ray encoding. Encoding mpg2 takes much less horsepower, has much fewer calculations to make, and so is much faster, and with the space available on Blu-ray discs, you can use a high enough bit rate that the lower efficiency of mpg2 vs. AVC doesn't matter as much -- you *probably* won't see a difference. One downside is that some, usually lower powered devices, are no longer set up to decode mpg2 [though Blu--ray players are fine because of DVD compatibility], and without hardware assisted video decoding *may* have problems playing 1080p mpg2 at high bit rates.

mike  –  8 years ago  –  Avez-vous trouver ce commentaire utile ? oui | non (+24)

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