draft-ietf-cellar-ffv1-v4-07.txt		draft-ietf-cellar-ffv1-v4-08.txt
	cellar M. Niedermayer		cellar M. Niedermayer
	Internet-Draft D. Rice		Internet-Draft D. Rice
	Intended status: Standards Track J. Martinez		Intended status: Standards Track J. Martinez
	Expires: 12 April 2020 10 October 2019		Expires: 25 April 2020 23 October 2019
	FFV1 Video Coding Format Version 4		FFV1 Video Coding Format Version 4
	draft-ietf-cellar-ffv1-v4-07		draft-ietf-cellar-ffv1-v4-08
	Abstract		Abstract
	This document defines FFV1, a lossless intra-frame video encoding		This document defines FFV1, a lossless intra-frame video encoding
	format. FFV1 is designed to efficiently compress video data in a		format. FFV1 is designed to efficiently compress video data in a
	variety of pixel formats. Compared to uncompressed video, FFV1		variety of pixel formats. Compared to uncompressed video, FFV1
	offers storage compression, frame fixity, and self-description, which		offers storage compression, frame fixity, and self-description, which
	makes FFV1 useful as a preservation or intermediate video format.		makes FFV1 useful as a preservation or intermediate video format.
	Status of This Memo		Status of This Memo
	skipping to change at page 1, line 34 ¶		skipping to change at page 1, line 34 ¶
	Internet-Drafts are working documents of the Internet Engineering		Internet-Drafts are working documents of the Internet Engineering
	Task Force (IETF). Note that other groups may also distribute		Task Force (IETF). Note that other groups may also distribute
	working documents as Internet-Drafts. The list of current Internet-		working documents as Internet-Drafts. The list of current Internet-
	Drafts is at https://datatracker.ietf.org/drafts/current/.		Drafts is at https://datatracker.ietf.org/drafts/current/.
	Internet-Drafts are draft documents valid for a maximum of six months		Internet-Drafts are draft documents valid for a maximum of six months
	and may be updated, replaced, or obsoleted by other documents at any		and may be updated, replaced, or obsoleted by other documents at any
	time. It is inappropriate to use Internet-Drafts as reference		time. It is inappropriate to use Internet-Drafts as reference
	material or to cite them other than as "work in progress."		material or to cite them other than as "work in progress."
	This Internet-Draft will expire on 12 April 2020.		This Internet-Draft will expire on 25 April 2020.
	Copyright Notice		Copyright Notice
	Copyright (c) 2019 IETF Trust and the persons identified as the		Copyright (c) 2019 IETF Trust and the persons identified as the
	document authors. All rights reserved.		document authors. All rights reserved.
	This document is subject to BCP 78 and the IETF Trust's Legal		This document is subject to BCP 78 and the IETF Trust's Legal
	Provisions Relating to IETF Documents (https://trustee.ietf.org/		Provisions Relating to IETF Documents (https://trustee.ietf.org/
	license-info) in effect on the date of publication of this document.		license-info) in effect on the date of publication of this document.
	Please review these documents carefully, as they describe your rights		Please review these documents carefully, as they describe your rights
	skipping to change at page 42, line 37 ¶		skipping to change at page 42, line 37 ¶
	4.6.2. plane_pixel_height		4.6.2. plane_pixel_height
	"plane_pixel_height[ p ]" is the height in pixels of plane p of the		"plane_pixel_height[ p ]" is the height in pixels of plane p of the
	slice.		slice.
	"plane_pixel_height[ 0 ]" and "plane_pixel_height[ 1 + (		"plane_pixel_height[ 0 ]" and "plane_pixel_height[ 1 + (
	chroma_planes ? 2 : 0 ) ]" value is "slice_pixel_height".		chroma_planes ? 2 : 0 ) ]" value is "slice_pixel_height".
	If "chroma_planes" is set to 1, "plane_pixel_height[ 1 ]" and		If "chroma_planes" is set to 1, "plane_pixel_height[ 1 ]" and
	"plane_pixel_height[ 2 ]" value is "ceil( slice_pixel_height /		"plane_pixel_height[ 2 ]" value is "ceil( slice_pixel_height / (1 <<
	log2_v_chroma_subsample )".		log2_v_chroma_subsample) )".
	4.6.3. slice_pixel_height		4.6.3. slice_pixel_height
	"slice_pixel_height" is the height in pixels of the slice.		"slice_pixel_height" is the height in pixels of the slice.
	Its value is "floor( ( slice_y + slice_height ) * slice_pixel_height		Its value is "floor( ( slice_y + slice_height ) * slice_pixel_height
	/ num_v_slices ) - slice_pixel_y".		/ num_v_slices ) - slice_pixel_y".
	4.6.4. slice_pixel_y		4.6.4. slice_pixel_y
	skipping to change at page 45, line 27 ¶		skipping to change at page 45, line 27 ¶
	Table 19		Table 19
	4.8.3. slice_crc_parity		4.8.3. slice_crc_parity
	"slice_crc_parity" 32 bits that are chosen so that the slice as a		"slice_crc_parity" 32 bits that are chosen so that the slice as a
	whole has a crc remainder of 0.		whole has a crc remainder of 0.
	This is equivalent to storing the crc remainder in the 32-bit parity.		This is equivalent to storing the crc remainder in the 32-bit parity.
	The CRC generator polynomial used is the standard IEEE CRC polynomial		The CRC generator polynomial used is the standard IEEE CRC polynomial
	(0x104C11DB7) with initial value 0.		(0x104C11DB7), with initial value 0, without pre-inversion and
			without post-inversion.
	4.9. Quantization Table Set		4.9. Quantization Table Set
	The Quantization Table Sets are stored by storing the number of equal		The Quantization Table Sets are stored by storing the number of equal
	entries -1 of the first half of the table (represented as "len - 1"		entries -1 of the first half of the table (represented as "len - 1"
	in the pseudo-code below) using the method described in Range Non		in the pseudo-code below) using the method described in Range Non
	Binary Values (#range-non-binary-values). The second half doesn't		Binary Values (#range-non-binary-values). The second half doesn't
	need to be stored as it is identical to the first with flipped sign.		need to be stored as it is identical to the first with flipped sign.
	"scale" and "len_count[ i ][ j ]" are temporary values used for the		"scale" and "len_count[ i ][ j ]" are temporary values used for the
	computing of "context_count[ i ]" and are not used outside		computing of "context_count[ i ]" and are not used outside
	skipping to change at page 50, line 44 ¶		skipping to change at page 50, line 44 ¶
	10. Changelog		10. Changelog
	See https://github.com/FFmpeg/FFV1/commits/master		See https://github.com/FFmpeg/FFV1/commits/master
	(https://github.com/FFmpeg/FFV1/commits/master)		(https://github.com/FFmpeg/FFV1/commits/master)
	11. Normative References		11. Normative References
	[I-D.ietf-cellar-ffv1]		[I-D.ietf-cellar-ffv1]
	Niedermayer, M., Rice, D., and J. Martinez, "FFV1 Video		Niedermayer, M., Rice, D., and J. Martinez, "FFV1 Video
	Coding Format Version 0, 1, and 3", Internet-Draft, draft-		Coding Format Version 0, 1, and 3", Work in Progress,
	ietf-cellar-ffv1-09, 6 September 2019,		Internet-Draft, draft-ietf-cellar-ffv1-09, 6 September
			2019,
	<https://tools.ietf.org/html/draft-ietf-cellar-ffv1-09>.		<https://tools.ietf.org/html/draft-ietf-cellar-ffv1-09>.
	[ISO.15444-1.2016]		[ISO.15444-1.2016]
	International Organization for Standardization,		International Organization for Standardization,
	"Information technology -- JPEG 2000 image coding system:		"Information technology -- JPEG 2000 image coding system:
	Core coding system", October 2016.		Core coding system", October 2016.
	[ISO.9899.1990]		[ISO.9899.1990]
	International Organization for Standardization,		International Organization for Standardization,
	"Programming languages - C", 1990.		"Programming languages - C", 1990.
	skipping to change at page 52, line 15 ¶		skipping to change at page 52, line 15 ¶
	[ISO.14496-10.2014]		[ISO.14496-10.2014]
	International Organization for Standardization,		International Organization for Standardization,
	"Information technology -- Coding of audio-visual objects		"Information technology -- Coding of audio-visual objects
	-- Part 10: Advanced Video Coding", September 2014.		-- Part 10: Advanced Video Coding", September 2014.
	[ISO.14496-12.2015]		[ISO.14496-12.2015]
	International Organization for Standardization,		International Organization for Standardization,
	"Information technology -- Coding of audio-visual objects		"Information technology -- Coding of audio-visual objects
	-- Part 12: ISO base media file format", December 2015.		-- Part 12: ISO base media file format", December 2015.
	[Matroska] IETF, "Matroska", 2016,		[Matroska] IETF, "Matroska", 2016, <https://datatracker.ietf.org/doc/
	<https://datatracker.ietf.org/doc/draft-lhomme-cellar-		draft-lhomme-cellar-matroska/>.
	matroska/>.
	[NUT] Niedermayer, M., "NUT Open Container Format", December		[NUT] Niedermayer, M., "NUT Open Container Format", December
	2013, <https://ffmpeg.org/~michael/nut.txt>.		2013, <https://ffmpeg.org/~michael/nut.txt>.
	[range-coding]		[range-coding]
	Nigel, G. and N. Martin, "Range encoding: an algorithm for		Nigel, G. and N. Martin, "Range encoding: an algorithm for
	removing redundancy from a digitised message.", July 1979.		removing redundancy from a digitised message.", July 1979.
	[REFIMPL] Niedermayer, M., "The reference FFV1 implementation / the		[REFIMPL] Niedermayer, M., "The reference FFV1 implementation / the
	FFV1 codec in FFmpeg", undated, <https://ffmpeg.org>.		FFV1 codec in FFmpeg", undated, <https://ffmpeg.org>.
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