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1080p from High-Definition DVDs?
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<blockquote data-quote="ΠΑΝΑΓΙΩΤΗΣ ΒΟΓΙΑΤΖΑΚΗΣ" data-source="post: 3128" data-attributes="member: 80"><p><strong>Κι όμως...</strong></p><p></p><p></p><p></p><p></p><p></p><p>Τάκη, τα 1080p είναι εκτός των επίσημων τεχνικών προδιαγραφών του αλγόριθμου MPEG2, για τους ψηφιακούς δίσκους το ταβάνι είναι τα 1080i. Δες εδώ, φαντάζομαι να αποδέχεσαι ότι πρόκειται για το πιο έμπειρο site τεχνικών προδιαγραφών:</p><p>en.wikipedia.org/wiki/MPEG-2</p><p></p><p></p><p></p><p>MPEG-2 Profiles</p><p> Abbr. Name Frames YUV Streams Comment</p><p>SP Simple Profile P, I 4:2:0 1 no interlacing</p><p>MP Main Profile P, I, B 4:2:0 1 </p><p>422P 4:2:2 Profile P, I, B 4:2:2 1 </p><p>SNR SNR Profile P, I, B 4:2:0 1–2 SNR: Signal to Noise Ratio</p><p>SP Spatial Profile P, I, B 4:2:0 1–3 low, normal and high quality decoding</p><p>HP High Profile P, I, B 4:2:2 1–3 </p><p></p><p>MPEG-2 Levels</p><p> Abbr. Name Pixel/line Lines Framerate (Hz) Bitrate (Mbit/s)</p><p>LL Low Level 352 288 30 4</p><p>ML Main Level 720 576 30 15</p><p>H-14 High 1440 1440 1152 30 60</p><p>HL High Level 1920 1152 30 80</p><p></p><p>Profile @ Level Resolution (px) Framerate max. (Hz) Sampling Bitrate (Mbit/s) Application</p><p>SP@LL 176 × 144 15 4:2:0 0.096 Wireless handsets</p><p>SP@ML 352 × 288 15 4:2:0 0.384 PDAs</p><p> 320 × 240 24 </p><p>MP@LL 352 × 288 30 4:2:0 4 Set-top boxes (STB)</p><p>MP@ML 720 × 480 30 4:2:0 15 (DVD: 9.8) DVD, SD-DVB</p><p> 720 × 576 25 </p><p>MP@H-14 1440 × 1080i 30 4:2:0 60 (HDV: 25) HDV</p><p> 1280 × 720p 30 </p><p>MP@HL 1920 × 1080i 30 4:2:0 80 ATSC 1080i, 720p60, HD-DVB (HDTV)</p><p> 1280 × 720p 60 </p><p>422P@LL 4:2:2 </p><p>422P@ML 720 × 512 30 4:2:2 50 Sony IMX using I-frame only, Broadcast "contribution" video (I&P only, extra horizontal resolution for VBI information)</p><p> 720 × 608 25 </p><p>422P@H-14 1440 × 1080i 30 4:2:2 80 Potential future MPEG-2-based HD products from Sony and Panasonic</p><p> 1280 × 720p 60 </p><p>422P@HL 1920 × 1080i 30 4:2:2 300 Potential future MPEG-2-based HD products from Panasonic</p><p> 1280 × 720p 60 </p><p>[edit] </p><p></p><p>DVD</p><p>The DVD standard uses MPEG-2 video, but imposes some restrictions:</p><p> Allowed Resolutions </p><p> 720 × 480, 704 × 480, 352 × 480, 352 × 240 pixel (NTSC) </p><p> 720 × 576, 704 × 576, 352 × 576, 352 × 288 pixel (PAL) </p><p> Allowed Aspect ratio (image) (Display AR) </p><p> 4:3 </p><p> 16:9 (2.21:1 also specified but little if ever used) </p><p> Allowed Frame rates </p><p> 29.97 frame/s (NTSC) </p><p> 25 frame/s (PAL) </p><p>Note: By using a pattern of REPEAT_FIRST_FIELD flags on the headers of encoded pictures, pictures can be displayed for either two or three fields and almost any picture display rate (minimum 2/3 of the frame rate) can be achieved. This is most often used to display 23.976 (approximately film rate) video on NTSC. </p><p> Audio+video bitrate </p><p> Buffer average maximum 9.8 Mbit/s </p><p> Peak 15 Mbit/s </p><p> Minimum 300 Kbit/s </p><p> YUV 4:2:0 </p><p> Additional subtitles possible </p><p> Closed captioning (NTSC only) </p><p> Audio </p><p> Linear Pulse Code Modulation (LPCM): 48 kHz or 96 kHz; 16- or 24-bit; up to six channels (not all combinations possible due to bitrate constraints) </p><p> MPEG Layer 2 (MP2): 48 kHz, up to 5.1 channels (required in PAL players only) </p><p> Dolby Digital (DD, also known as AC-3): 48 kHz, 32–448 kbit/s, up to 5.1 channels </p><p> Digital Theater Systems (DTS): 754 kbit/s or 1510 kbit/s (not required for DVD player compliance) </p><p> NTSC DVDs must contain at least one LPCM or Dolby Digital audio track. </p><p> PAL DVDs must contain at least one MPEG Layer 2, LPCM, or Dolby Digital audio track. </p><p> Players are not required to playback audio with more than two channels, but must be able to downmix multichannel audio to two channels. </p><p> GOP structure </p><p> Sequence header must be present at the beginning of every GOP </p><p> Maximum frames per GOP: 18 (NTSC) / 15 (PAL), i.e. 0.6 seconds both </p><p> Closed GOP required for multiple-angle DVDs </p><p>[edit] </p><p></p><p>DVB</p><p>Application-specific restrictions on MPEG-2 video in the DVB standard:</p><p>Allowed resolutions for SDTV:</p><p> 720, 640, 544, 480 or 352 × 480 pixel, 24/1.001, 24, 30/1.001 or 30 frame/s </p><p> 352 × 240 pixel, 24/1.001, 24, 30/1.001 or 30 frame/s </p><p> 720, 704, 544, 480 or 352 × 576 pixel, 25 frame/s </p><p> 352 × 288 pixel, 25 frame/s </p><p>For HDTV:</p><p> 720 x 576 x 50 frames/s progressive (576p50) </p><p> 1280 x 720 x 25 or 50 frames/s progressive (720p50) </p><p> 1440 or 1920 x 1080 x 25 frames/s progressive (1080p25 - film mode) </p><p> 1440 or 1920 x 1080 x 25 frames/s interlace (1080i25) </p><p> <strong>1920 x 1080 x 50 frames/s progressive (1080p50) possible future H.264/AVC format </strong></p><p>[edit] </p><p></p><p>ATSC</p><p>Allowed resolutions:</p><p> 1920 × 1080 pixel, 30 frame/s (1080i) </p><p> 1280 × 720 pixel, 60 frame/s (720p) </p><p> 720 × 576 pixel, 25 frame/s (576i, 576p) </p><p> 720 or 640 × 480 pixel, 30 frame/s (480i, 480p) </p><p>Note: 1080i is encoded with 1920 × 1088 pixel frames, but the last 8 lines are discarded prior to display.</p><p></p><p></p><p>Όπως βλέπεις, στη γραμμή που σου έχω τονισμένη, <strong>1080p με MPEG2 προβλέπεται μελλοντικά και μόνο για μετάδοση μέσω δορυφόρου και μόνο στα 50 frames, με τη χρήση του νέου αλγόριθμου Η.264/AVC</strong>. H Sony από την άλλη μεριά είχε δεσμευτεί ότι δεν θα χρησιμοποιούσε τον VC1 αλγόριθμο, οπότε το υλικό στα bluray δισκάκια αναγκαστικά θα ήταν αποθηκευμένο στα 1080i.</p></blockquote><p></p>
[QUOTE="ΠΑΝΑΓΙΩΤΗΣ ΒΟΓΙΑΤΖΑΚΗΣ, post: 3128, member: 80"] [b]Κι όμως...[/b] Τάκη, τα 1080p είναι εκτός των επίσημων τεχνικών προδιαγραφών του αλγόριθμου MPEG2, για τους ψηφιακούς δίσκους το ταβάνι είναι τα 1080i. Δες εδώ, φαντάζομαι να αποδέχεσαι ότι πρόκειται για το πιο έμπειρο site τεχνικών προδιαγραφών: en.wikipedia.org/wiki/MPEG-2 MPEG-2 Profiles Abbr. Name Frames YUV Streams Comment SP Simple Profile P, I 4:2:0 1 no interlacing MP Main Profile P, I, B 4:2:0 1 422P 4:2:2 Profile P, I, B 4:2:2 1 SNR SNR Profile P, I, B 4:2:0 1–2 SNR: Signal to Noise Ratio SP Spatial Profile P, I, B 4:2:0 1–3 low, normal and high quality decoding HP High Profile P, I, B 4:2:2 1–3 MPEG-2 Levels Abbr. Name Pixel/line Lines Framerate (Hz) Bitrate (Mbit/s) LL Low Level 352 288 30 4 ML Main Level 720 576 30 15 H-14 High 1440 1440 1152 30 60 HL High Level 1920 1152 30 80 Profile @ Level Resolution (px) Framerate max. (Hz) Sampling Bitrate (Mbit/s) Application SP@LL 176 × 144 15 4:2:0 0.096 Wireless handsets SP@ML 352 × 288 15 4:2:0 0.384 PDAs 320 × 240 24 MP@LL 352 × 288 30 4:2:0 4 Set-top boxes (STB) MP@ML 720 × 480 30 4:2:0 15 (DVD: 9.8) DVD, SD-DVB 720 × 576 25 MP@H-14 1440 × 1080i 30 4:2:0 60 (HDV: 25) HDV 1280 × 720p 30 MP@HL 1920 × 1080i 30 4:2:0 80 ATSC 1080i, 720p60, HD-DVB (HDTV) 1280 × 720p 60 422P@LL 4:2:2 422P@ML 720 × 512 30 4:2:2 50 Sony IMX using I-frame only, Broadcast "contribution" video (I&P only, extra horizontal resolution for VBI information) 720 × 608 25 422P@H-14 1440 × 1080i 30 4:2:2 80 Potential future MPEG-2-based HD products from Sony and Panasonic 1280 × 720p 60 422P@HL 1920 × 1080i 30 4:2:2 300 Potential future MPEG-2-based HD products from Panasonic 1280 × 720p 60 [edit] DVD The DVD standard uses MPEG-2 video, but imposes some restrictions: Allowed Resolutions 720 × 480, 704 × 480, 352 × 480, 352 × 240 pixel (NTSC) 720 × 576, 704 × 576, 352 × 576, 352 × 288 pixel (PAL) Allowed Aspect ratio (image) (Display AR) 4:3 16:9 (2.21:1 also specified but little if ever used) Allowed Frame rates 29.97 frame/s (NTSC) 25 frame/s (PAL) Note: By using a pattern of REPEAT_FIRST_FIELD flags on the headers of encoded pictures, pictures can be displayed for either two or three fields and almost any picture display rate (minimum 2/3 of the frame rate) can be achieved. This is most often used to display 23.976 (approximately film rate) video on NTSC. Audio+video bitrate Buffer average maximum 9.8 Mbit/s Peak 15 Mbit/s Minimum 300 Kbit/s YUV 4:2:0 Additional subtitles possible Closed captioning (NTSC only) Audio Linear Pulse Code Modulation (LPCM): 48 kHz or 96 kHz; 16- or 24-bit; up to six channels (not all combinations possible due to bitrate constraints) MPEG Layer 2 (MP2): 48 kHz, up to 5.1 channels (required in PAL players only) Dolby Digital (DD, also known as AC-3): 48 kHz, 32–448 kbit/s, up to 5.1 channels Digital Theater Systems (DTS): 754 kbit/s or 1510 kbit/s (not required for DVD player compliance) NTSC DVDs must contain at least one LPCM or Dolby Digital audio track. PAL DVDs must contain at least one MPEG Layer 2, LPCM, or Dolby Digital audio track. Players are not required to playback audio with more than two channels, but must be able to downmix multichannel audio to two channels. GOP structure Sequence header must be present at the beginning of every GOP Maximum frames per GOP: 18 (NTSC) / 15 (PAL), i.e. 0.6 seconds both Closed GOP required for multiple-angle DVDs [edit] DVB Application-specific restrictions on MPEG-2 video in the DVB standard: Allowed resolutions for SDTV: 720, 640, 544, 480 or 352 × 480 pixel, 24/1.001, 24, 30/1.001 or 30 frame/s 352 × 240 pixel, 24/1.001, 24, 30/1.001 or 30 frame/s 720, 704, 544, 480 or 352 × 576 pixel, 25 frame/s 352 × 288 pixel, 25 frame/s For HDTV: 720 x 576 x 50 frames/s progressive (576p50) 1280 x 720 x 25 or 50 frames/s progressive (720p50) 1440 or 1920 x 1080 x 25 frames/s progressive (1080p25 - film mode) 1440 or 1920 x 1080 x 25 frames/s interlace (1080i25) [B]1920 x 1080 x 50 frames/s progressive (1080p50) possible future H.264/AVC format [/B] [edit] ATSC Allowed resolutions: 1920 × 1080 pixel, 30 frame/s (1080i) 1280 × 720 pixel, 60 frame/s (720p) 720 × 576 pixel, 25 frame/s (576i, 576p) 720 or 640 × 480 pixel, 30 frame/s (480i, 480p) Note: 1080i is encoded with 1920 × 1088 pixel frames, but the last 8 lines are discarded prior to display. Όπως βλέπεις, στη γραμμή που σου έχω τονισμένη, [B]1080p με MPEG2 προβλέπεται μελλοντικά και μόνο για μετάδοση μέσω δορυφόρου και μόνο στα 50 frames, με τη χρήση του νέου αλγόριθμου Η.264/AVC[/B]. H Sony από την άλλη μεριά είχε δεσμευτεί ότι δεν θα χρησιμοποιούσε τον VC1 αλγόριθμο, οπότε το υλικό στα bluray δισκάκια αναγκαστικά θα ήταν αποθηκευμένο στα 1080i. [/QUOTE]
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