Whats considered HD/Blueray resolution?

[shagratt71]

Hi Guys, I have been encoding (x264) a few of my bluray discs and resizing the resolution down to get a smaller file size. Some of the resolutions I've resized to are 1184x480, 1280x528, 1280x688, 1200x496, 2885x1280, 1088x448. What I would like to know is what qualifies for it to be Hi-Def blue ray quality?. All the encodes I've done look very good to my eyes and most in my opinion would qualify for above DVD quality.

My second question is basically for naming purposes for my vidoe files and to keep track of what I have. If an encode is above DVD quality but not quite Blue-ray/HD, what is it called?

Thanks for any replies

[edDV]

Hi Guys, I have been encoding (x264) a few of my bluray discs and resizing the resolution down to get a smaller file size. Some of the resolutions I've resized to are 1184x480, 1280x528, 1280x688, 1200x496, 2885x1280, 1088x448. What I would like to know is what qualifies for it to be Hi-Def blue ray quality?. All the encodes I've done look very good to my eyes and most in my opinion would qualify for above DVD quality.

To be Blue-Ray compliant*, it must be 1280x720p23.976 with letterbox if not 16:9. Video codec can be h.264, VC-1 or MPeg2. Audio can be AC3, DTS or other but for AVCHD disc it must be AC3.

For "Blu-Ray" medium quality, h.264 bit rate should be in the 6-10 Mbps range.


*See "What is Blu-Ray?" for other details.
https://www.videohelp.com/hd

[leghorn]

Referring to meGUI...a resolution of 1440x800 should be possible too.

[shagratt71]

Hi Guys, I have been encoding (x264) a few of my bluray discs and resizing the resolution down to get a smaller file size. Some of the resolutions I've resized to are 1184x480, 1280x528, 1280x688, 1200x496, 2885x1280, 1088x448. What I would like to know is what qualifies for it to be Hi-Def blue ray quality?. All the encodes I've done look very good to my eyes and most in my opinion would qualify for above DVD quality.

To be Blue-Ray compliant*, it must be 1280x720p23.976 with letterbox if not 16:9. Video codec can be h.264, VC-1 or MPeg2. Audio can be AC3, DTS or other but for AVCHD disc it must be AC3.

For "Blu-Ray" medium quality, h.264 bit rate should be in the 6-10 Mbps range.


*See "What is Blu-Ray?" for other details.
https://www.videohelp.com/hd

Hi edDV,

So what would these resolutions be classed as?: 1184x480, 1280x528, 1280x688, 1200x496, 2885x1280, 1088x448.

[edDV]

To be compliant, Blu-Ray/AVCHD disc HD resolutions are 1920x1080, 1440x1080 (anamorphic) or 1280x720.

That isn't to say other resolutions won't play as files. That varies by player.

Hi edDV,

So what would these resolutions be classed as?: 1184x480, 1280x528, 1280x688, 1200x496, 2885x1280, 1088x448.

Those would be non-spec square pixel

1184x480 Aspect Ratio = 2.47:1
1280x528 = 2.42:1
1280x688 = 1.86:1
1200x496 = 2.46:1
2885x1280 = 2.25:1 <-- won't play. Exceeds 1920x1080 max resolution.
1088x448 = 2.42:1

[shagratt71]

To be compliant, Blu-Ray/AVCHD HD resolutions are 1920x1080, 1440x1080 (anamorphic) or 1280x720.

That isn't to say other resolutions won't play as files. That varies by player.

Ive never had a problem with any of the files I've encoded so far on my WDTV Live hub and PS3. So I take it non of the resolutions I mentioned are Blu-Ray/HD quality because of the resolution being wrong?

2885x1280 LOL, sorry that was a typo!

EdDV, with them being non spec square pixel, would this effect the quality at all?

[edDV]

To be compliant, Blu-Ray/AVCHD HD resolutions are 1920x1080, 1440x1080 (anamorphic) or 1280x720.

That isn't to say other resolutions won't play as files. That varies by player.

Ive never had a problem with any of the files I've encoded so far on my WDTV Live hub and PS3. So I take it non of the resolutions I mentioned are Blu-Ray/HD quality because of the resolution being wrong?

Blu-Ray and AVCHD discs have specifications for most variables and codecs. To make a standard disc, you need to be within spec. "Quality" is not a spec but subjectively usually varies with source quality and bit rate.

http://en.wikipedia.org/wiki/Blu-ray_Disc
http://en.wikipedia.org/wiki/Blu-ray_Disc_recordable
http://www.avchd-info.org/format/index.html

When you say "Blu-Ray", that usually means a disc that will play in any Blu-Ray player. Not all Blu-Ray players will play an AVCHD (Rev1) disc. No current Blu-Ray player will play extended format AVCHD (Rev2) discs (e.g. 1080 60p/50p @28 Mbps).

[edDV]

EdDV, with them being non spec square pixel, would this effect the quality at all?

Apart from being compatible for Blu-Ray, quality depends on several factors. Resolution does not define quality. The bit rates used for the codec of choice usually limits quality. Blu-Ray can use video bit rates up to 38+ Mb/s. Typical commercial Blu-Ray discs will use 10-25 Mbps for 1080 24/25p h.264. If you re-encode that to a lower bit rate, quality will suffer. If you downsize, quality will suffer.

Another way to consider quality is how far can you degrade specs before you can see the difference on your current TV. That would depend on the capability of the TV and opinion of the viewer. Objectively, you will get best quality if you encode to the display's native resolution. That is usually 1920x1080 or 1366x768. This avoids re-scaling in the TV. Display rescale always hurts image quality.

[shagratt71]

To be compliant, Blu-Ray/AVCHD HD resolutions are 1920x1080, 1440x1080 (anamorphic) or 1280x720.

That isn't to say other resolutions won't play as files. That varies by player.

Ive never had a problem with any of the files I've encoded so far on my WDTV Live hub and PS3. So I take it non of the resolutions I mentioned are Blu-Ray/HD quality because of the resolution being wrong?

Blu-Ray and AVCHD discs have specifications for most variables and codecs. To make a standard disc, you need to be within spec. "Quality" is not a spec but subjectively usually varies with source quality and bit rate.

http://en.wikipedia.org/wiki/Blu-ray_Disc
http://en.wikipedia.org/wiki/Blu-ray_Disc_recordable
http://www.avchd-info.org/format/index.html

When you say "Blu-Ray", that usually means a disc that will play in any Blu-Ray player.

Sorry EdDV, I think I used the wrong choice of words, Im not trying to author any files to disc. Ive just converted some DVD/Blu-Ray to x264/MKV files so I can put them on my media player. Im just wanting to know if in general the resolutions mentioned may be considered HI-DEF/Blu-Ray quality or would they still be considered SD?. Sorry for any confusion

[edDV]

To be compliant, Blu-Ray/AVCHD HD resolutions are 1920x1080, 1440x1080 (anamorphic) or 1280x720.

That isn't to say other resolutions won't play as files. That varies by player.

Ive never had a problem with any of the files I've encoded so far on my WDTV Live hub and PS3. So I take it non of the resolutions I mentioned are Blu-Ray/HD quality because of the resolution being wrong?

Blu-Ray and AVCHD discs have specifications for most variables and codecs. To make a standard disc, you need to be within spec. "Quality" is not a spec but subjectively usually varies with source quality and bit rate.

http://en.wikipedia.org/wiki/Blu-ray_Disc
http://en.wikipedia.org/wiki/Blu-ray_Disc_recordable
http://www.avchd-info.org/format/index.html

When you say "Blu-Ray", that usually means a disc that will play in any Blu-Ray player.

Sorry EdDV, I think I used the wrong choice of words, Im not trying to author any files to disc. Ive just converted some DVD/Blu-Ray to x264/MKV files so I can put them on my media player. Im just wanting to know if in general the resolutions mentioned may be considered HI-DEF/Blu-Ray quality or would they still be considered SD?. Sorry for any confusion

No easy way to respond because "quality" is subjective.

The cut-off between SD and HD is usually taken to be 720x576 anamorphic which translates into 1024x576 square pixel 16:9 display resolution. But some politicians try to argue that progressive 720x576 is HD. Most others would disagree. The lowest "standard" DVB/ATSC HD display resolution is 1280x720 although 960x720 anamorphic transmission is allowed under DVB.

The lowest Blu-Ray HD resolution is 1280x720 square pixel.

But as said above, resolution by itself does not determine "quality".

Personally, I consider letterboxed movies at 1280x720 to be insufficient resolution for a large screen. I'd draw the quality line at 1440x1080 anamorphic which is what the BBC uses for HD broadcast. Supporting h.264 bit rate at that resolution would be ~8-10 Mbps.

[edDV]

I've discussed this with a few others. The consensus seems to be 720x576 (anamorphic) is still SD. 960x720 (anamorphic) is lower HD. In-between is disputed territory.

Most consider anything over 720x576 should be considered HD but I'm in the camp that says 768x576 D2/D3 tape format is still SD. FYI For years the PBS show "Austin City Limits" recorded Hitachi HD cameras to composite D3 tape but called it HD.

[johns0]

To be Blue-Ray compliant*, it must be 1280x720p23.976 with letterbox if not 16:9. Video codec can be h.264, VC-1 or MPeg2. Audio can be AC3, DTS or other but for AVCHD disc it must be AC3.

For "Blu-Ray" medium quality, h.264 bit rate should be in the 6-10 Mbps range.


*See "What is Blu-Ray?" for other details.
https://www.videohelp.com/hd[/QUOTE]

My sony bdp-s350 and bdp-s380 play dvd avchd with dts audio.

[edDV]

To be Blue-Ray compliant*, it must be 1280x720p23.976 with letterbox if not 16:9. Video codec can be h.264, VC-1 or MPeg2. Audio can be AC3, DTS or other but for AVCHD disc it must be AC3.

For "Blu-Ray" medium quality, h.264 bit rate should be in the 6-10 Mbps range.


*See "What is Blu-Ray?" for other details.
https://www.videohelp.com/hd[/QUOTE]

My sony bdp-s350 and bdp-s380 play dvd avchd with dts audio.

Some players will but the standard says AC3 only.