With the huge increase in resolution I want to avoid anything less than 1080p if possible.s55 wrote:There is nothing stopping you choosing AppleTV preset, then saving it back again with a Source Max of 1080p. In theory, that may work fine.
You can do the same with the iPad preset, but it's probably not worth it. With limited space, 720P is going to be jut fine for the majority imo.
It really depends on your source. There is nothing to be gained from upscaling content of a lower resolution and, in fact, is not allowed in the GUI.ross2000 wrote:With the huge increase in resolution I want to avoid anything less than 1080p if possible.
Eeeep. I was set on a WD TV Live before this announcement. Is it just a bitrate change, or are there advanced options that are not supported in 4.0? I use the high profile with ref=4 and bframes=6 and it would suck if they wouldn't play. My highest average bitrate is about 7mb for Transformers, not sure what it peaks at though (I have it capped at 40mb, just so it never exceeds the source bitrate).mduell wrote:Might need a maxrate limit on the tv since the cripped A5 only supports level 4.0.
The only difference between level 4.1 and 4.0 is the bitrate allowed; for high profile it's 62.5Mbps vs 25Mbps. It may stutter if the peak bitrate exceeds 25Mbps for too long (I don't know how big the buffer is, perhaps a second).Tree Dude wrote:Eeeep. I was set on a WD TV Live before this announcement. Is it just a bitrate change, or are there advanced options that are not supported in 4.0? I use the high profile with ref=4 and bframes=6 and it would suck if they wouldn't play. My highest average bitrate is about 7mb for Transformers, not sure what it peaks at though (I have it capped at 40mb, just so it never exceeds the source bitrate).mduell wrote:Might need a maxrate limit on the tv since the cripped A5 only supports level 4.0.
Level 3.1 only supports 720p resolution, not 1080p.Virduk wrote:I must say I'm annoyed that the atv can only handle level 4.0 whilst the ipad can handle 4.1. Adds an additional wrinkle in wanting the best file that will play on all devices.mduell wrote: Might need a maxrate limit on the tv since the cripped A5 only supports level 4.0.
What does 4.0 actually add over 3.1 aside from higher bitrates? anything?
For H.264, level 4.1 for all primary video streams, regardless of resolution (even SD).Virduk wrote:It also makes me wonder what bluray uses.
That's one of the common mistakes people do, Blu-ray does not support level 4.1 despite often tagging their bitstream as such. One result of this is that there's a considerable amount of Blu-ray derived hardware that support 4.0+Blu-ray but not actual level 4.1 media, sometimes it accepts them but shows artifacts, stops displaying or even crashes if you use all of 4.1...Rodeo wrote:For H.264, level 4.1 for all primary video streams, regardless of resolution (even SD).Virduk wrote:It also makes me wonder what bluray uses.
As you pointed out, it doesn't make use of all "features" allowed by level 4.1. But it does "use level 4.1" in that it exceeds some of the constraints specified by level 4.0. So a decoder which only supports level 4.0 may struggle and/or fail to play Blu-ray H.264 streams (whereas one that does support level 4.1 is more likely to play it just fine, as long as it also supports Open GOP).tlindgren wrote:That's one of the common mistakes people do, Blu-ray does not support level 4.1 despite often tagging their bitstream as such. One result of this is that there's a considerable amount of Blu-ray derived hardware that support 4.0+Blu-ray but not actual level 4.1 media, sometimes it accepts them but shows artifacts, stops displaying or even crashes if you use all of 4.1...Rodeo wrote:For H.264, level 4.1 for all primary video streams, regardless of resolution (even SD).Virduk wrote:It also makes me wonder what bluray uses.
A compliant Blu-ray decoder is required to handle:
- Level 4.0, except requiring constant framerate, specific resolution/framerates/pixel aspect ratios, "Open GOP" and no more than 1 second between key-frames!
- "Blu-ray", tagged as level 4.1 but only accepted if a host of other requirements are fulfilled, specifically:
- All the restrictions mentioned for 4.0 encoding still applies.
- Must be "sliced" into at least 4 parts to allow slice-based multi-threading.
- Maximum bit-rate is 40 Mbps (vbv-maxrate=40000) with "30000" vbv-bufsize.
Level 4.1/High requires the decoder to handle 62.5 Mbps! (maxrate/bufsize 62500/50000). For comparison, Level4.0/High is 25 Mbps (25000/20000) so it IS higher than 4.0.
Testing done about a year ago or so showed that the PS3 will struggle with a 40 Mbps maxrate unless you use slices.tlindgren wrote:The Open GOP requirement probably isn't that bad
If implemented correctly in the encoder, this should actually improve compression efficiency. Also, the Blu-ray spec. places some specific restrictions on Open GOP (i.e. it's more restrictive that what the H.264 spec allows). You'd need to ask an x264 developer for more detail though.
but the "no more than 1 second between key-frames" hurt compression a LOT and the slicing has the potential to do this too! Slice based multi-threading was originally specified to allow easier decoding on the Cell-processor in PS3, but it was a flop and AFAIK not even the PS-3 actually use this any longer!
The AppleTV 2 preset already uses CRF (Constant Quality) encoding, so it should be as simple as increasing the resolution.jonahlee wrote:Ha anyone figured out what would be the best preset, as I am guessing that just changing size is actually going to lower quality, you are going to have to raise the size as well.
Code: Select all
vbv-bufsize=31250:vbv-maxrate=25000
I have taken Inception from a Blu-Ray source, converted with the AppleTV2 preset, but with the resolution bumped up to 1080p, I have also cranked up the bit-rate to 10k just to make things interesting, finally I applied the advanced settings changes that were recommended. The file spat out is about 9Gb in size.tc60045 wrote:curious: anyone know how ATV2 will handle 1080p as encoded per Rodeo's suggestions? We had an ATV 1, and 2 ATV2s, but will replace the 1 with a 3, moving the 3 into our media room. Would like the convenience of one-encode, but <sigh> life is not always that easy
Thanks
Bug fixes.i_am_rufus wrote:When played back on an AppleTV2 running the latest O/S update with the new screen layout it plays back PERFECTLY, albeit at 720p because of the AppleTV2's limitations, but certainly no stuttering at all.
However.......
When played back on an AppleTV2 running the older O/S prior to the latest update, it stutters and freezes constantly.
So, the question is, what has Apple done to the firmware to be able to playback big movie files now, but couldn't before?
1080p or High Profile aren't not officially supported by Apple on the AppleTV 2. That doesn't mean the AppleTV 2 is incapable of playing it. Same applies to e.g. iPhone 3G S (supports Baseline @ 3.0 officially, actually plays High @ 3.0 just fine - or more if you don't use iTunes for syncing).i_am_rufus wrote:Finally, the AppleTV2 is listed in it's specs as only supporting Main Profile Lever 3.1, hence why I would get stuttering of course, but why is it fine after the update? Has Apple upgraded it's capabilities to Main or High Profile Level 4.0 just like the AppleTV3?
That's not always true. For example, if the video is VC-1 instead of h.264.mrtn wrote:FYI, if you didn't know it you don't need to re-encode 720p and 1080p MKVs on "the new iPad".
Just use the OS X application Subler http://code.google.com/p/subler/ and change the container to m4v. Plays perfectly in the video app.
It looks amazing!
Too bad it doesn't work in the old VLC app.
Can you guys recommend an app like VLC where you don't have to keep the files on your computer?
Oh, thanks. I guess I never have had a VC-1 file.nightstrm wrote: That's not always true. For example, if the video is VC-1 instead of h.264.
You must have missed this thread...DarkVamp wrote:Still no new Preset in the nightly builds?