Texture
06-30-2006, 11:51 AM
Thought you all might find this article interesting...
From TV TECHNOLOGY vol.24, no. 14 - June 28, 2006
Sony, Panasonic Launch AVCHD
New hi-def standard could be an effective competitor to HDV.
by Craig Johnston
Seattle
Several weeks after NAB 2006 shut its doors, the Japanese offices of broadcast equipment powerhouses Panasonic and Sony announced a new video format: AVCHD. "AVC" stands for Advanced Video Coding. You know what "HD" stands for.
Why wait until after the big show to roll it out? AVCHD is aimed at consumer DVD camcorders. But given the capabilities the new format brings, it wouldn't be surprising to see it follow the pathway of the DV format, which was originally touted for consumer level video camera, then ended up being adapted all the way to high-definition.
For now, comparisons with AVCHD can be made against HDV, the other consumer or prosumer grade HD video format, which rolled out just a few years ago.
HDV records to tape. AVCHD records to 8 cm (about 3 1/4 inch) red laser DVDs. (Panasonic, in a separate announcement, said it is also developing solid-state-memory products for AVCHD.)
HDV compresses to and records at 25 Mbps. AVCHD compresses to and records at 18 Mbps.
Both are long-GOP, meaning their compression stretches out over several frames rather than each frame's compression being contained within the individual frame itself. (This has ramifications for editing, and generally means more rendering time.)
HDV is and MPEG-2 codec, while AVCHD is MPEG-4, Part 10, also known as H.264.
Both can record at 1080i and 720p though it is unlikely that all camcorders will be able to switch between the two.
Not to forget audio, AVCHD employs Dolby Digital or Linear PCM for an audio codec.
Nothing earth-shattering about the comparison between the two formats, so far. But then you get down to this line of the release: "The MPEG-4/H.264 codec is a promising technology which is over two times more efficient than MPEG-2 or MPEG-4 codec technologies."
While not singling out HDV in the release, the companies are saying that AVCHD is at least twice as efficient as HDV. At twice the efficiency, a simple math exercise would show that with its 18 Mbps encoding, AVCHD is 28 percetn more efficient on the storage side, and that would still allow AVCHD to produce about a 70 percent increase in picture quality over HDV.
One key it the camcorder format is that it is designed for "red laser" 8cm DVDs, which are relatively cheap. The same size Blu-ray consumer data disks cost around $20 dollars each. Both types of the new HD DVD players are expected to be able to playback AVCHD disks.
Sony and Panasonic also chose to use the MPEG-2 transport stream. Though it has nothing to do with the encoding, the MPEG-2 transport stream was chosen because modern digital TVs and set-top boxes already work with it.
PROS AND CONS-UMERS
Perusing Web postings about the new format, this writer found them generally impressed with AVCHD and predicting a quick demise of HDV. Among the comments were references to the fragility of DV-size tape as a recording media, and the problems with drop-out in an I-frame of the long-GOP encoding.
On the negative side, posters pointed out the one hour recording time f and HDV tape versus the approximately 20-minute recoding time of the 8cm red laser DVDs, and questioned the battery life of an AVCHD camcorder with its more computationally intensive encoding scheme.
Nonlinear editing vendors including avid and Adobe are reported to be working to support AVCHD. Th the extent they've developed technology to handle the long-GOP issues with HDV, that technology should be applicable to AVCHD's long-GOP as well.
At this writing, none of the other camcorder manufacturers TV TECHNOLOGY contacted have announced plans for an AVCHD camcorder, though the joint Sony and Panasonic announcement notes: "The two companies have started preparations of licensing to extensively promote the format throughout the industry."
One representative from Panasonics's professional division did weigh in his reservations over the use of AVCHD for professional video production.
"If you buy into our position that HDV is not at a level that a professional would want to shoot at, because of the amount of compression involved, then yes, I would say that this follows that same philosophy," said Phil LIvingston, Panasonic's technical liaison.
Toward that end, Panasonic introduced an option for its new AJ-HPC2000 P2 HD camcorder to allow it to encode with the MPEG-4/H.264 codec, but at 50Mbps. A sony spokesman said the company currently has no plans to incorporate AVCHD technology into its professional video camcorder product line for broadcast and production.
So is AVCHD going to end up following DV's path to become a full-fledged professional video format? It's still early in the game.
"The reason this is all taking time to roll out is that for the H.264 compression standard, in relative terms, the ink is just getting dry," said Livingston.
From TV TECHNOLOGY vol.24, no. 14 - June 28, 2006
Sony, Panasonic Launch AVCHD
New hi-def standard could be an effective competitor to HDV.
by Craig Johnston
Seattle
Several weeks after NAB 2006 shut its doors, the Japanese offices of broadcast equipment powerhouses Panasonic and Sony announced a new video format: AVCHD. "AVC" stands for Advanced Video Coding. You know what "HD" stands for.
Why wait until after the big show to roll it out? AVCHD is aimed at consumer DVD camcorders. But given the capabilities the new format brings, it wouldn't be surprising to see it follow the pathway of the DV format, which was originally touted for consumer level video camera, then ended up being adapted all the way to high-definition.
For now, comparisons with AVCHD can be made against HDV, the other consumer or prosumer grade HD video format, which rolled out just a few years ago.
HDV records to tape. AVCHD records to 8 cm (about 3 1/4 inch) red laser DVDs. (Panasonic, in a separate announcement, said it is also developing solid-state-memory products for AVCHD.)
HDV compresses to and records at 25 Mbps. AVCHD compresses to and records at 18 Mbps.
Both are long-GOP, meaning their compression stretches out over several frames rather than each frame's compression being contained within the individual frame itself. (This has ramifications for editing, and generally means more rendering time.)
HDV is and MPEG-2 codec, while AVCHD is MPEG-4, Part 10, also known as H.264.
Both can record at 1080i and 720p though it is unlikely that all camcorders will be able to switch between the two.
Not to forget audio, AVCHD employs Dolby Digital or Linear PCM for an audio codec.
Nothing earth-shattering about the comparison between the two formats, so far. But then you get down to this line of the release: "The MPEG-4/H.264 codec is a promising technology which is over two times more efficient than MPEG-2 or MPEG-4 codec technologies."
While not singling out HDV in the release, the companies are saying that AVCHD is at least twice as efficient as HDV. At twice the efficiency, a simple math exercise would show that with its 18 Mbps encoding, AVCHD is 28 percetn more efficient on the storage side, and that would still allow AVCHD to produce about a 70 percent increase in picture quality over HDV.
One key it the camcorder format is that it is designed for "red laser" 8cm DVDs, which are relatively cheap. The same size Blu-ray consumer data disks cost around $20 dollars each. Both types of the new HD DVD players are expected to be able to playback AVCHD disks.
Sony and Panasonic also chose to use the MPEG-2 transport stream. Though it has nothing to do with the encoding, the MPEG-2 transport stream was chosen because modern digital TVs and set-top boxes already work with it.
PROS AND CONS-UMERS
Perusing Web postings about the new format, this writer found them generally impressed with AVCHD and predicting a quick demise of HDV. Among the comments were references to the fragility of DV-size tape as a recording media, and the problems with drop-out in an I-frame of the long-GOP encoding.
On the negative side, posters pointed out the one hour recording time f and HDV tape versus the approximately 20-minute recoding time of the 8cm red laser DVDs, and questioned the battery life of an AVCHD camcorder with its more computationally intensive encoding scheme.
Nonlinear editing vendors including avid and Adobe are reported to be working to support AVCHD. Th the extent they've developed technology to handle the long-GOP issues with HDV, that technology should be applicable to AVCHD's long-GOP as well.
At this writing, none of the other camcorder manufacturers TV TECHNOLOGY contacted have announced plans for an AVCHD camcorder, though the joint Sony and Panasonic announcement notes: "The two companies have started preparations of licensing to extensively promote the format throughout the industry."
One representative from Panasonics's professional division did weigh in his reservations over the use of AVCHD for professional video production.
"If you buy into our position that HDV is not at a level that a professional would want to shoot at, because of the amount of compression involved, then yes, I would say that this follows that same philosophy," said Phil LIvingston, Panasonic's technical liaison.
Toward that end, Panasonic introduced an option for its new AJ-HPC2000 P2 HD camcorder to allow it to encode with the MPEG-4/H.264 codec, but at 50Mbps. A sony spokesman said the company currently has no plans to incorporate AVCHD technology into its professional video camcorder product line for broadcast and production.
So is AVCHD going to end up following DV's path to become a full-fledged professional video format? It's still early in the game.
"The reason this is all taking time to roll out is that for the H.264 compression standard, in relative terms, the ink is just getting dry," said Livingston.