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FLV、F4V格式标准文档.pdf
Introduction
The FLV file format
The F4V file format
What’s new in Video File Format 10
Speex
XMP Metadata
The FLV File Format
The FLV header
The FLV file body
FLV tags
Audio tags
AUDIODATA
AACAUDIODATA
Video tags
VIDEODATA
AVCVIDEOPACKET
Data tags
onMetaData
The F4V File Format
The F4V box
ftyp box
moov box
mvhd box
trak box
udta box
meta box
mdia box
minf box
stbl box
tkhd box
mdhd box
stsd box
stsc box
stts box
ctts box
stco and co64 boxes
stss box
stsz box
chpl box
pdin box
mdat box
Required structure
Supported media types
Unsupported boxes
F4V Metadata
Tag box
ilst box
Image metadata
Text metadata
styl box
hlit box
hclr box
krok box
dlay box
drpo box
drpt box
href box
tbox box
blnk box
twrp box
XMP Metadata
uuid box
Video File Format Specification
Version 10
Copyright © 2008 Adobe Systems Incorporated. All rights reserved. This manual may not be copied, photocopied, reproduced,
translated, or converted to any electronic or machine-readable form in whole or in part without written approval from Adobe
Systems Incorporated. Notwithstanding the foregoing, a person obtaining an electronic version of this manual from Adobe may
print out one copy of this manual provided that no part of this manual may be printed out, reproduced, distributed, resold, or
transmitted for any other purposes, including, without limitation, commercial purposes, such as selling copies of this
documentation or providing paid-for support services.
Trademarks
Adobe, ActionScript, Flash, Flash Media Server, XMP, and Flash Player are either registered trademarks or trademarks of Adobe
Systems Incorporated and may be registered in the United States or in other jurisdictions including internationally. Other
product names, logos, designs, titles, words, or phrases mentioned within this publication may be trademarks, service marks, or
trade names of Adobe Systems Incorporated or other entities and may be registered in certain jurisdictions including
internationally. No right or license is granted to any Adobe trademark.
Third-Party Information
This guide contains links to third-party websites that are not under the control of Adobe Systems Incorporated, and Adobe
Systems Incorporated is not responsible for the content on any linked site. If you access a third-party website mentioned in this
guide, then you do so at your own risk. Adobe Systems Incorporated provides these links only as a convenience, and the inclusion
of the link does not imply that Adobe Systems Incorporated endorses or accepts any responsibility for the content on those third-
party sites. No right, license or interest is granted in any third party technology referenced in this guide.
NOTICE: THIS PUBLICATION AND THE INFORMATION HEREIN IS FURNISHED “AS IS”, IS SUBJECT TO
CHANGE WITHOUT NOTICE, AND SHOULD NOT BE CONSTRUED AS A COMMITMENT BY ADOBE
SYSTEMS INCORPORATED. ADOBE SYSTEMS INCORPORATED ASSUMES NO RESPONSIBILITY OR
LIABILITY FOR ANY ERRORS OR INACCURACIES, MAKES NO WARRANTY OF ANY KIND (EXPRESS,
IMPLIED, OR STATUTORY) WITH RESPECT TO THIS PUBLICATION, AND EXPRESSLY DISCLAIMS ANY AND
ALL WARRANTIES OF MERCHANTABILITY, FITNESS FOR PARTICULAR PURPOSES, AND
NONINFRINGEMENT OF THIRD PARTY RIGHTS.
Adobe Systems Incorporated
Published November 2008
Contents
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
The FLV file format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
The F4V file format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
What’s new in Video File Format 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Speex . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
XMP Metadata . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Chapter 1: The FLV File Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
The FLV header . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
The FLV file body . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
FLV tags. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Audio tags . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
AUDIODATA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
AACAUDIODATA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Video tags . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
VIDEODATA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
AVCVIDEOPACKET. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Data tags . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
onMetaData. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Chapter 2: The F4V File Format . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
The F4V box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
ftyp box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
moov box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
mvhd box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
trak box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
udta box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
meta box. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
mdia box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
minf box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
stbl box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
tkhd box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
mdhd box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
stsd box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
i
stsc box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
stts box. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
ctts box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
stco and co64 boxes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
stss box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
stsz box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
chpl box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
pdin box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
mdat box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Required structure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Supported media types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Unsupported boxes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Chapter 3: F4V Metadata . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35
Tag box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
ilst box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Image metadata . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Text metadata . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
styl box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
hlit box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
hclr box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
krok box. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
dlay box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
drpo box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
drpt box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
href box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
tbox box. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
blnk box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
twrp box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
XMP Metadata . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
uuid box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
ii
Contents
Introduction
This document provides technical format information for the video file formats supported by
Adobe® Flash® Player software—FLV and F4V.
Adobe seriously considers all feedback to the video file format specification. E-mail any
unclear or potentially erroneous information within the specification to Adobe at
flashformat@adobe.com. All such email submissions shall be subject to the Submitted
Materials guidelines in the Terms of Use at www.adobe.com/misc/copyright.html.
The FLV file format
Starting with SWF files published for Flash Player 6, Flash Player can exchange audio, video,
and data over RTMP connections with the Adobe Flash Media Server™. One way to feed data
to Flash Media Server (and thus on to Flash Player clients) is from files in the FLV file format.
Starting with SWF files published for Flash Player 7, Flash Player can also play FLV files
directly with MIME type video/x-flv.
An FLV file encodes synchronized audio and video streams. The audio and video data within
FLV files are encoded in the same way as audio and video within SWF files.
This document describes FLV version 1. For more information on the FLV format, see
Chapter 1, “The FLV File Format,” on page 3.
The F4V file format
Starting with SWF files published for Flash Player 9 Update 3 (9,0,115,0), Flash Player can
play F4V files. The F4V format is based on the format specified by ISO/IEC 14496-12: ISO
base media file format. For more information on the F4V format, see Chapter 2, “The F4V
File Format,” on page 17.
A large part of the F4V format involves metadata. For more information on F4V metadata,
see Chapter 3, “F4V Metadata,” on page 35.
1
What’s new in Video File Format 10
The following features are new in the Flash video file format specifications (both FLV and
F4V) corresponding to Flash Player 10.
Speex
Flash Player 10 supports the open source Speex audio codec. Speex data can serve as the audio
stream in an FLV file. See “AUDIODATA” on page 6.
XMP Metadata
The F4V file format supports a box type called 'uuid' which can store data formatted in
Adobe’s Extensible Metadata Platform (XMP™) and present it to a SWF file via ActionScript®.
See “XMP Metadata” on page 43.
2
Introduction
CHAPTER 1
The FLV File Format
1
Each tag type in an FLV file constitutes a single stream. There can be no more than one audio
and one video stream, synchronized together, in an FLV file. An FLV file cannot define
multiple independent streams of a single type.
Unlike SWF files, FLV files store multibyte integers in big-endian byte order. For example, as
a UI16 in SWF file format, the byte sequence that represents the number 300 (0x12C) is
0x2C 0x01; as a UI16 in FLV file format, the byte sequence that represents the number 300 is
0x01 0x2C. Also, FLV files use a 3-byte integer type that is not used in SWF files: a UI24
represents an unsigned 24-bit integer.
3
The FLV header
All FLV files begin with the following header:
FLV header
Field
Signature
Signature
Signature
Version
TypeFlagsReserved
TypeFlagsAudio
TypeFlagsReserved
TypeFlagsVideo
DataOffset
Type
UI8
UI8
UI8
UI8
UB[5]
UB[1]
UB[1]
UB[1]
UI32
Comment
Signature byte always 'F' (0x46)
Signature byte always 'L' (0x4C)
Signature byte always 'V' (0x56)
File version (for example, 0x01 for FLV
version 1)
Must be 0
Audio tags are present
Must be 0
Video tags are present
Offset in bytes from start of file to start
of body (that is, size of header)
The DataOffset field usually has a value of 9 for FLV version 1. This field is present to
accommodate larger headers in future versions.
The FLV file body
After the FLV header, the remainder of an FLV file consists of alternating back-pointers and
tags. They interleave as shown in the following table:
FLV file body
Field
PreviousTagSize0
Tag1
PreviousTagSize1
Type
UI32
FLVTAG
UI32
Comment
Always 0
First tag
Size of previous tag, including its
header. For FLV version 1, this value
is 11 plus the DataSize of the previous
tag.
Tag2
...
FLVTAG
Second tag
4
The FLV File Format
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