Apple Intermediate Codec: Difference between revisions
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(Even while codec is undiscovered that should not stop us from writing some information about it.) |
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Each tile has data coded as 4 bands (probably in YYUV order) and DCT is employed. | Each tile has data coded as 4 bands (probably in YYUV order) and DCT is employed. | ||
Each band looks like it's coded with Golomb codes (possibly as delta values, there are about 4 very similar coding modes for that too). | |||
[[Category:Video Codecs]] | [[Category:Video Codecs]] | ||
[[Category:Undiscovered Video Codecs]] | [[Category:Undiscovered Video Codecs]] | ||
[[Category:Formats missing in MPlayer]] | [[Category:Formats missing in MPlayer]] | ||
Revision as of 03:27, 28 October 2009
- FOURCCs: icod
- Company: Apple
- Samples: http://samples.mplayerhq.hu/V-codecs/icod/
- Decoder: http://www.apple.com/support/downloads/appleintermediatecodec101.html
- Description: http://support.apple.com/kb/HT2704
Lossy codec used in Final Cut Express HD and iLife ’05
Apple Lists its Features as:
- Intra Only
- 4:2:0 color
- 8-bits per sample
More technical details
Each frame starts with 24-byte header:
6- 7 frame width 8- 9 frame height 10-11 frame width (or maybe tile width) 12-13 frame height(or maybe tile height)
16 high nibble is ?, low nibble is ? 18 high nibble is ?, low nibble is ? 19 high 2 bits are ?, next 2 bits are ?, low 3 bits are ?
It is followed by some tables consisting of 16-bit little-endian entries (Huffman weights?).
There are 4 versions of coded data which differ by coded colourspaces (the same YUV420 but 8/16 bits per component and linear/non-linear?).
Each tile has data coded as 4 bands (probably in YYUV order) and DCT is employed.
Each band looks like it's coded with Golomb codes (possibly as delta values, there are about 4 very similar coding modes for that too).