PlayStation Motion Decoder - Revision history

Multimedia Mike: update doc links

2007-11-28T15:28:52Z

update doc links

← Older revision		Revision as of 08:28, 28 November 2007
Line 2:		Line 2:
	* Extension: usually str		* Extension: usually str
	* Samples: http://samples.mplayerhq.hu/game-formats/psx-str/		* Samples: http://samples.mplayerhq.hu/game-formats/psx-str/
	* Documentation: http://~~jpsxdec~~.~~googlecode~~.com/~~files~~/~~STR_file_format0~~-22.~~txt~~		* Documentation:
			** http://code.google.com/p/jpsxdec/downloads/list (latest file format document)
			** http://jcatki.no-ip.org/cdxa/

	The original [[Sony PlayStation]] contains a component named the motion decoder (MDEC) which processes blocks of data compressed using a [[Motion JPEG]]-like coding scheme. The unit processes specially formatted blocks of data which contain encoded [[YUV]] [[Macroblock\|macroblocks]]. The formatted blocks specify DC and AC coefficients and lengths of zero-runs to be used in an [[Discrete Cosine Transform\|inverse discrete cosine transform]]. The unit is designed to decode 9000 macroblocks per second. A video frame with a resolution of 320x240 is comprised of 300 macroblocks. This means that the MDEC can decode 30 frames per second at maximum capacity.		The original [[Sony PlayStation]] contains a component named the motion decoder (MDEC) which processes blocks of data compressed using a [[Motion JPEG]]-like coding scheme. The unit processes specially formatted blocks of data which contain encoded [[YUV]] [[Macroblock\|macroblocks]]. The formatted blocks specify DC and AC coefficients and lengths of zero-runs to be used in an [[Discrete Cosine Transform\|inverse discrete cosine transform]]. The unit is designed to decode 9000 macroblocks per second. A video frame with a resolution of 320x240 is comprised of 300 macroblocks. This means that the MDEC can decode 30 frames per second at maximum capacity.

Multimedia Mike: add documentation link

2007-11-27T17:14:05Z

add documentation link

← Older revision		Revision as of 10:14, 27 November 2007
Line 1:		Line 1:
	* Company: [[Sony]]		* Company: [[Sony]]
	* Extension: usually str		* Extension: usually str
	* Samples: [http://samples.mplayerhq.hu/game-formats/psx-str/ http://~~samples~~.~~mplayerhq~~.hu/~~game-formats~~/~~psx~~-~~str/]~~		* Samples: http://samples.mplayerhq.hu/game-formats/psx-str/
			* Documentation: http://jpsxdec.googlecode.com/files/STR_file_format0-22.txt

	The original [[Sony PlayStation]] contains a component named the motion decoder (MDEC) which processes blocks of data compressed using a [[Motion JPEG]]-like coding scheme. The unit processes specially formatted blocks of data which contain encoded [[YUV]] [[Macroblock\|macroblocks]]. The formatted blocks specify DC and AC coefficients and lengths of zero-runs to be used in an [[Discrete Cosine Transform\|inverse discrete cosine transform]]. The unit is designed to decode 9000 macroblocks per second. A video frame with a resolution of 320x240 is comprised of 300 macroblocks. This means that the MDEC can decode 30 frames per second at maximum capacity.		The original [[Sony PlayStation]] contains a component named the motion decoder (MDEC) which processes blocks of data compressed using a [[Motion JPEG]]-like coding scheme. The unit processes specially formatted blocks of data which contain encoded [[YUV]] [[Macroblock\|macroblocks]]. The formatted blocks specify DC and AC coefficients and lengths of zero-runs to be used in an [[Discrete Cosine Transform\|inverse discrete cosine transform]]. The unit is designed to decode 9000 macroblocks per second. A video frame with a resolution of 320x240 is comprised of 300 macroblocks. This means that the MDEC can decode 30 frames per second at maximum capacity.

Multimedia Mike: Actually, this one is in FFmpeg but is merely incomplete

2007-11-13T14:04:14Z

Actually, this one is in FFmpeg but is merely incomplete

← Older revision		Revision as of 07:04, 13 November 2007
Line 15:		Line 15:
	[[Category:Video Codecs]]		[[Category:Video Codecs]]
	[[Category:Game Formats]]		[[Category:Game Formats]]
	[[Category:~~Formats missing in FFmpeg~~]]		[[Category:Incomplete Video Codecs]]

DonDiego: Add to Formats missing in FFmpeg category.

2007-11-13T13:59:34Z

Add to Formats missing in FFmpeg category.

← Older revision		Revision as of 06:59, 13 November 2007
Line 15:		Line 15:
	[[Category:Video Codecs]]		[[Category:Video Codecs]]
	[[Category:Game Formats]]		[[Category:Game Formats]]
			[[Category:Formats missing in FFmpeg]]

Dashcloud: Update samples link

2006-08-18T02:32:16Z

Update samples link

← Older revision		Revision as of 19:32, 17 August 2006
Line 1:		Line 1:
	* Company: [[Sony]]		* Company: [[Sony]]
	* Extension: usually str		* Extension: usually str
	* Samples: [http://~~www~~.mplayerhq.hu~~/MPlayer/samples~~/game-formats/psx-str/ http://~~www~~.mplayerhq.hu~~/MPlayer/samples~~/game-formats/psx-str/]		* Samples: [http://samples.mplayerhq.hu/game-formats/psx-str/ http://samples.mplayerhq.hu/game-formats/psx-str/]

	The original [[Sony PlayStation]] contains a component named the motion decoder (MDEC) which processes blocks of data compressed using a [[Motion JPEG]]-like coding scheme. The unit processes specially formatted blocks of data which contain encoded [[YUV]] [[Macroblock\|macroblocks]]. The formatted blocks specify DC and AC coefficients and lengths of zero-runs to be used in an [[Discrete Cosine Transform\|inverse discrete cosine transform]]. The unit is designed to decode 9000 macroblocks per second. A video frame with a resolution of 320x240 is comprised of 300 macroblocks. This means that the MDEC can decode 30 frames per second at maximum capacity.		The original [[Sony PlayStation]] contains a component named the motion decoder (MDEC) which processes blocks of data compressed using a [[Motion JPEG]]-like coding scheme. The unit processes specially formatted blocks of data which contain encoded [[YUV]] [[Macroblock\|macroblocks]]. The formatted blocks specify DC and AC coefficients and lengths of zero-runs to be used in an [[Discrete Cosine Transform\|inverse discrete cosine transform]]. The unit is designed to decode 9000 macroblocks per second. A video frame with a resolution of 320x240 is comprised of 300 macroblocks. This means that the MDEC can decode 30 frames per second at maximum capacity.

Multimedia Mike: Clarifications

2006-04-10T03:14:47Z

Clarifications

← Older revision		Revision as of 20:14, 9 April 2006
Line 3:		Line 3:
	* Samples: [http://www.mplayerhq.hu/MPlayer/samples/game-formats/psx-str/ http://www.mplayerhq.hu/MPlayer/samples/game-formats/psx-str/]		* Samples: [http://www.mplayerhq.hu/MPlayer/samples/game-formats/psx-str/ http://www.mplayerhq.hu/MPlayer/samples/game-formats/psx-str/]

	The original [[Sony PlayStation]] contains a component named the motion decoder (MDEC) which processes blocks of data compressed using a [[Motion JPEG]]-like coding scheme. The unit specially formatted blocks of data which contain encoded [[YUV]] [[Macroblock\|macroblocks]]. The formatted blocks specify DC and AC coefficients and lengths of zero-runs to be used in an [[Discrete Cosine Transform\|inverse discrete cosine transform]]. The unit is designed ~~to be able~~ to decode 9000 macroblocks per second. At a resolution of 320x240~~, which~~ is comprised of 300 macroblocks~~, this yields~~ 30 frames per second at maximum capacity.		The original [[Sony PlayStation]] contains a component named the motion decoder (MDEC) which processes blocks of data compressed using a [[Motion JPEG]]-like coding scheme. The unit processes specially formatted blocks of data which contain encoded [[YUV]] [[Macroblock\|macroblocks]]. The formatted blocks specify DC and AC coefficients and lengths of zero-runs to be used in an [[Discrete Cosine Transform\|inverse discrete cosine transform]]. The unit is designed to decode 9000 macroblocks per second. A video frame with a resolution of 320x240 is comprised of 300 macroblocks. This means that the MDEC can decode 30 frames per second at maximum capacity.

	While the MDEC hardware is rigid about the format of incoming data, many PlayStation games have gone an extra step by [[Huffman]]-compressing the data, decompressing it in software before sending it to the MDEC for final decode. Many games opted to use Huffman tables from [[MPEG-1]]. However, other games use custom tables. In doing this, developers can A) optimize compression for a given set of [[FMV]]~~; and B)~~ thwart curious gamers who explore the data files on a PlayStation disc and seek to view the files with 3rd-party software.		While the MDEC hardware is rigid about the format of incoming data, many PlayStation games have gone an extra step by [[Huffman]]-compressing the data, decompressing it in software before sending it to the MDEC for final decode. Many games opted to use Huffman tables from [[MPEG-1]]. However, other games use custom tables. In doing this, developers can
			# optimize compression for a given set of [[FMV]]
			# thwart curious gamers who explore the data files on a PlayStation disc and seek to view the files with 3rd-party software

	== References ==		== References ==

Multimedia Mike: expand a little bit

2006-03-25T01:00:37Z

expand a little bit

← Older revision		Revision as of 18:00, 24 March 2006
Line 3:		Line 3:
	* Samples: [http://www.mplayerhq.hu/MPlayer/samples/game-formats/psx-str/ http://www.mplayerhq.hu/MPlayer/samples/game-formats/psx-str/]		* Samples: [http://www.mplayerhq.hu/MPlayer/samples/game-formats/psx-str/ http://www.mplayerhq.hu/MPlayer/samples/game-formats/psx-str/]

	The original Sony PlayStation contains a component named the motion decoder (MDEC) which processes blocks of data compressed using a [[Motion JPEG]]-like coding scheme.		The original [[Sony PlayStation]] contains a component named the motion decoder (MDEC) which processes blocks of data compressed using a [[Motion JPEG]]-like coding scheme. The unit specially formatted blocks of data which contain encoded [[YUV]] [[Macroblock\|macroblocks]]. The formatted blocks specify DC and AC coefficients and lengths of zero-runs to be used in an [[Discrete Cosine Transform\|inverse discrete cosine transform]]. The unit is designed to be able to decode 9000 macroblocks per second. At a resolution of 320x240, which is comprised of 300 macroblocks, this yields 30 frames per second at maximum capacity.

			While the MDEC hardware is rigid about the format of incoming data, many PlayStation games have gone an extra step by [[Huffman]]-compressing the data, decompressing it in software before sending it to the MDEC for final decode. Many games opted to use Huffman tables from [[MPEG-1]]. However, other games use custom tables. In doing this, developers can A) optimize compression for a given set of [[FMV]]; and B) thwart curious gamers who explore the data files on a PlayStation disc and seek to view the files with 3rd-party software.

			== References ==

			[http://www.zophar.net/tech/psx.html "Everything You Have Always Wanted to Know about the Playstation But Were Afraid to Ask."], available in a number of formats, describes the motion decoder in further detail as well as the rest of the PlayStation console.

			[[Category:Video Codecs]]
	[[Category:Game Formats]]		[[Category:Game Formats]]
	~~[[Category:Video Codecs]]~~

Multimedia Mike at 04:45, 15 March 2006

2006-03-15T04:45:21Z

New page

* Company: [[Sony]]
* Extension: usually str
* Samples: [http://www.mplayerhq.hu/MPlayer/samples/game-formats/psx-str/ http://www.mplayerhq.hu/MPlayer/samples/game-formats/psx-str/]

The original Sony PlayStation contains a component named the motion decoder (MDEC) which processes blocks of data compressed using a [[Motion JPEG]]-like coding scheme.

[[Category:Game Formats]]
[[Category:Video Codecs]]