Dan Hitchman
Senior HTF Member
- Joined
- Jun 11, 1999
- Messages
- 2,712
DVD, while successful, is a seriously compromised product.
Currently, you have to choose between decent video or audio and usually the choice on most titles is to sacrifice superior audio (as of right now full bitrate DTS 24/96 or DTS-ES Discrete 6.1) for a little bit better video quality.
DVD's video is already over compressed with many compromises made to the originally intended look of a film in order for the MPEG-2 format to do its job well. Pixelization and motion artifacts can still pop up on the best of titles. Ringing and/or artifical edge enhancement gives a harsh or gritty quality to many titles as well. The 4:2:0 component video ratio chosen for standard DVD has given rise to chroma upscaling problems in most DVD players while the MPEG-2 decoders are trying to re-create the original professional 4:4:4 signal.
DVD's audio formats are lossy compressed with a maximum of 5.1 (or in the case of DTS-ES, 6.1) discrete channels. Many of us in this hobby spend thousands of dollars on high quality speakers, processors, and amps to get the 'nth degree of audiophile sound, which is not possible with lossy compressed formats such as Dolby Digital and DTS. Lossy compression is a major step backwards when there are already high resolution uncompressed or lossless compressed formats such as 24/96 and 24/192 LPCM and Direct Stream Digital (DSD) available now, and disc capacities are rapidly increasing.
DVD's subtitles look about as good as 8-bit ATARI video game text most of the time and they sometimes are placed well into the lower letterbox bar, which make them impossible to see for those with front and rear projection masking systems.
Pan and scan is still prevalent although we are starting a new century and more and more home theater enthusiasts are getting the message that OAR is the only way to go.
------------------
With all of these problems (and there are many more I could site) I hope you will take the time to develope a truly stunning HD-DVD format free from most (if not all) of these compromises.
Here is my proposal for the minimum specs. that should be applied to any future HD-DVD format:
1) 1920x1080i with support for 24 fps and true ~30 fps rates. No high frequency video filtering, which would lead to a loss of fine picture detail! Internal player downconversion for consumers who wish 720p, 480p, or 480i signals as well.
2) Proper flag encoding for 2:3 pulldown detection for correct de-interlacing to 1920x1080p in the digital domain inside the player.
3) 4:4:4 professional component video stream ratio.
4) Lossless or very low lossy compression applied to the video stream. If that means two discs for certain movies then so be it as long as the highest quality video and audio is presented. THAT MEANS NO MPEG-4 OR CURRENT MPEG-2 TECHNOLOGY!
5) 24 bit, smooth fonts for subtitles, and they must remain inside the picture frame.
6) Seamless layer changes (if applicable).
7) Primary language ultra-high resolution soundtrack-- 1.0 up to at least 7.1 discrete channels encoded with lossless compressed (bit for bit recreation mode) 24 bit/96 kHz LPCM (24 bit/192 kHz LPCM if possible) or Sony/Philips' DSD formats. No watermarking on the audio stream itself in order to preserve the utmost quality.
8) Backwards compatible primary language track and/or supplemental language tracks-- Dolby Digital, or full bitrate DTS 24/96, or half or full bitrate DTS-ES Discrete 6.1 (whichever will fit, on a case by case basis).
9) Audio commentary tracks-- Dolby Digital 192 kilobits/sec. format.
10) Original Aspect Ratios must be adhered to. No pan and scan or open-matte transfers. Period. Let's nip this in the bud once and for all.
Supplemental quality feature:
2.35:1 anamorphic enhancement (within the standard 1920x1080 1.78:1 HDTV frame) for 2.0:1 and above ratio widescreen movies. This is similar to the 1.78:1 (16x9) enhancement on current DVDs where all or most of the available pixels are used for the picture rather than black bars increasing the resolution of these super-wide movies on high quality digital widescreen front projection systems that utilize constant height/variable width screens and anamorphic lenses. Players could internally downconvert the 2.35:1 enhanced image to a proper geometrically sized 1.78:1 image with player added black bars to create the 2.0:1 and wider framing.
----------------
Obviously, if a disc with enough capacity were to be developed then I would highly recommend moving the video spec. up to true 1920x1080 progressive scan output, but with players that can downconvert internally to 1080i, 720p, and lower for those TVs not able to support 1080p currently. Within a couple of years there will be front and rear projection TVs with true 1080p support, so it would be smart to think ahead.
For all those concerned I hope a disc with these types of features is produced rather than some of the (yet again) seriously compromised HD-DVD formats being discussed at the DVD Forum meetings. Filmmakers would benefit by seeing their products reproduced as close to their vision as possible as well as all of us home theater hobbiest who only want the best source material for our expensive and hard earned audio and video equipment.
We should accept no less.
Thank you.
With best regards,
Dan
Currently, you have to choose between decent video or audio and usually the choice on most titles is to sacrifice superior audio (as of right now full bitrate DTS 24/96 or DTS-ES Discrete 6.1) for a little bit better video quality.
DVD's video is already over compressed with many compromises made to the originally intended look of a film in order for the MPEG-2 format to do its job well. Pixelization and motion artifacts can still pop up on the best of titles. Ringing and/or artifical edge enhancement gives a harsh or gritty quality to many titles as well. The 4:2:0 component video ratio chosen for standard DVD has given rise to chroma upscaling problems in most DVD players while the MPEG-2 decoders are trying to re-create the original professional 4:4:4 signal.
DVD's audio formats are lossy compressed with a maximum of 5.1 (or in the case of DTS-ES, 6.1) discrete channels. Many of us in this hobby spend thousands of dollars on high quality speakers, processors, and amps to get the 'nth degree of audiophile sound, which is not possible with lossy compressed formats such as Dolby Digital and DTS. Lossy compression is a major step backwards when there are already high resolution uncompressed or lossless compressed formats such as 24/96 and 24/192 LPCM and Direct Stream Digital (DSD) available now, and disc capacities are rapidly increasing.
DVD's subtitles look about as good as 8-bit ATARI video game text most of the time and they sometimes are placed well into the lower letterbox bar, which make them impossible to see for those with front and rear projection masking systems.
Pan and scan is still prevalent although we are starting a new century and more and more home theater enthusiasts are getting the message that OAR is the only way to go.
------------------
With all of these problems (and there are many more I could site) I hope you will take the time to develope a truly stunning HD-DVD format free from most (if not all) of these compromises.
Here is my proposal for the minimum specs. that should be applied to any future HD-DVD format:
1) 1920x1080i with support for 24 fps and true ~30 fps rates. No high frequency video filtering, which would lead to a loss of fine picture detail! Internal player downconversion for consumers who wish 720p, 480p, or 480i signals as well.
2) Proper flag encoding for 2:3 pulldown detection for correct de-interlacing to 1920x1080p in the digital domain inside the player.
3) 4:4:4 professional component video stream ratio.
4) Lossless or very low lossy compression applied to the video stream. If that means two discs for certain movies then so be it as long as the highest quality video and audio is presented. THAT MEANS NO MPEG-4 OR CURRENT MPEG-2 TECHNOLOGY!
5) 24 bit, smooth fonts for subtitles, and they must remain inside the picture frame.
6) Seamless layer changes (if applicable).
7) Primary language ultra-high resolution soundtrack-- 1.0 up to at least 7.1 discrete channels encoded with lossless compressed (bit for bit recreation mode) 24 bit/96 kHz LPCM (24 bit/192 kHz LPCM if possible) or Sony/Philips' DSD formats. No watermarking on the audio stream itself in order to preserve the utmost quality.
8) Backwards compatible primary language track and/or supplemental language tracks-- Dolby Digital, or full bitrate DTS 24/96, or half or full bitrate DTS-ES Discrete 6.1 (whichever will fit, on a case by case basis).
9) Audio commentary tracks-- Dolby Digital 192 kilobits/sec. format.
10) Original Aspect Ratios must be adhered to. No pan and scan or open-matte transfers. Period. Let's nip this in the bud once and for all.
Supplemental quality feature:
2.35:1 anamorphic enhancement (within the standard 1920x1080 1.78:1 HDTV frame) for 2.0:1 and above ratio widescreen movies. This is similar to the 1.78:1 (16x9) enhancement on current DVDs where all or most of the available pixels are used for the picture rather than black bars increasing the resolution of these super-wide movies on high quality digital widescreen front projection systems that utilize constant height/variable width screens and anamorphic lenses. Players could internally downconvert the 2.35:1 enhanced image to a proper geometrically sized 1.78:1 image with player added black bars to create the 2.0:1 and wider framing.
----------------
Obviously, if a disc with enough capacity were to be developed then I would highly recommend moving the video spec. up to true 1920x1080 progressive scan output, but with players that can downconvert internally to 1080i, 720p, and lower for those TVs not able to support 1080p currently. Within a couple of years there will be front and rear projection TVs with true 1080p support, so it would be smart to think ahead.
For all those concerned I hope a disc with these types of features is produced rather than some of the (yet again) seriously compromised HD-DVD formats being discussed at the DVD Forum meetings. Filmmakers would benefit by seeing their products reproduced as close to their vision as possible as well as all of us home theater hobbiest who only want the best source material for our expensive and hard earned audio and video equipment.
We should accept no less.
Thank you.
With best regards,
Dan