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NUT


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1 Description

NUT is a low overhead generic container format. It stores audio, video, subtitle and user-defined streams in a simple, yet efficient, way.

It was created by a group of FFmpeg and MPlayer developers in 2003 and was finalized in 2008.

The official nut specification is at svn://svn.mplayerhq.hu/nut In case of any differences between this text and the official specification, the official specification shall prevail.


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2 Modes

NUT has some variants signaled by using the flags field in its main header.

BROADCASTExtend the syncpoint to report the sender wallclock
PIPEOmit completely the syncpoint

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2.1 BROADCAST

The BROADCAST variant provides a secondary time reference to facilitate detecting endpoint latency and network delays. It assumes all the endpoint clocks are synchronized. To be used in real-time scenarios.


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2.2 PIPE

The PIPE variant assumes NUT is used as non-seekable intermediate container, by not using syncpoint removes unneeded overhead and reduces the overall memory usage.


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3 Container-specific codec tags


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3.1 Generic raw YUVA formats

Since many exotic planar YUVA pixel formats are not considered by the AVI/QuickTime FourCC lists, the following scheme is adopted for representing them.

The first two bytes can contain the values: Y1 = only Y Y2 = Y+A Y3 = YUV Y4 = YUVA

The third byte represents the width and height chroma subsampling values for the UV planes, that is the amount to shift the luma width/height right to find the chroma width/height.

The fourth byte is the number of bits used (8, 16, ...).

If the order of bytes is inverted, that means that each component has to be read big-endian.


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3.2 Raw Audio

ALAWA-LAW
ULAWMU-LAW
P<type><interleaving><bits>little-endian PCM
<bits><interleaving><type>Pbig-endian PCM

<type> is S for signed integer, U for unsigned integer, F for IEEE float <interleaving> is D for default, P is for planar. <bits> is 8/16/24/32

PFD[32]   would for example be signed 32 bit little-endian IEEE float

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3.3 Subtitles

UTF8Raw UTF-8
SSA[0]SubStation Alpha
DVDSDVD subtitles
DVBSDVB subtitles

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3.4 Raw Data

UTF8Raw UTF-8

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3.5 Codecs

3IV1non-compliant MPEG-4 generated by old 3ivx
ASV1Asus Video
ASV2Asus Video 2
CVIDCinepak
CYUVCreative YUV
DIVXnon-compliant MPEG-4 generated by old DivX
DUCKTruemotion 1
FFV1FFmpeg video 1
FFVHFFmpeg Huffyuv
H261ITU H.261
H262ITU H.262
H263ITU H.263
H264ITU H.264
HFYUHuffyuv
I263Intel H.263
IV31Indeo 3.1
IV32Indeo 3.2
IV50Indeo 5.0
LJPGITU JPEG (lossless)
MJLSITU JPEG-LS
MJPGITU JPEG
MPG4MS MPEG-4v1 (not ISO MPEG-4)
MP42MS MPEG-4v2
MP43MS MPEG-4v3
MP4VISO MPEG-4 Part 2 Video (from old encoders)
mpg1ISO MPEG-1 Video
mpg2ISO MPEG-2 Video
MRLEMS RLE
MSVCMS Video 1
RT21Indeo 2.1
RV10RealVideo 1.0
RV20RealVideo 2.0
RV30RealVideo 3.0
RV40RealVideo 4.0
SNOWFFmpeg Snow
SVQ1Sorenson Video 1
SVQ3Sorenson Video 3
theoXiph Theora
TM20Truemotion 2.0
UMP4non-compliant MPEG-4 generated by UB Video MPEG-4
VCR1ATI VCR1
VP30VP 3.0
VP31VP 3.1
VP50VP 5.0
VP60VP 6.0
VP61VP 6.1
VP62VP 6.2
VP70VP 7.0
WMV1MS WMV7
WMV2MS WMV8
WMV3MS WMV9
WV1Fnon-compliant MPEG-4 generated by ?
WVC1VC-1
XVIDnon-compliant MPEG-4 generated by old Xvid
XVIXnon-compliant MPEG-4 generated by old Xvid with interlacing bug

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Table of Contents


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About This Document

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