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160 lines
4.4 KiB
160 lines
4.4 KiB
\input texinfo @c -*- texinfo -*- |
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@documentencoding UTF-8 |
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@settitle NUT |
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@titlepage |
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@center @titlefont{NUT} |
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@end titlepage |
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@top |
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@contents |
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@chapter Description |
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NUT is a low overhead generic container format. It stores audio, video, |
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subtitle and user-defined streams in a simple, yet efficient, way. |
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It was created by a group of FFmpeg and MPlayer developers in 2003 |
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and was finalized in 2008. |
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The official nut specification is at svn://svn.mplayerhq.hu/nut |
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In case of any differences between this text and the official specification, |
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the official specification shall prevail. |
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@chapter Modes |
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NUT has some variants signaled by using the flags field in its main header. |
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@multitable @columnfractions .4 .4 |
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@item BROADCAST @tab Extend the syncpoint to report the sender wallclock |
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@item PIPE @tab Omit completely the syncpoint |
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@end multitable |
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@section BROADCAST |
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The BROADCAST variant provides a secondary time reference to facilitate |
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detecting endpoint latency and network delays. |
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It assumes all the endpoint clocks are synchronized. |
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To be used in real-time scenarios. |
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@section PIPE |
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The PIPE variant assumes NUT is used as non-seekable intermediate container, |
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by not using syncpoint removes unneeded overhead and reduces the overall |
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memory usage. |
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@chapter Container-specific codec tags |
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@section Generic raw YUVA formats |
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Since many exotic planar YUVA pixel formats are not considered by |
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the AVI/QuickTime FourCC lists, the following scheme is adopted for |
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representing them. |
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The first two bytes can contain the values: |
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Y1 = only Y |
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Y2 = Y+A |
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Y3 = YUV |
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Y4 = YUVA |
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The third byte represents the width and height chroma subsampling |
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values for the UV planes, that is the amount to shift the luma |
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width/height right to find the chroma width/height. |
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The fourth byte is the number of bits used (8, 16, ...). |
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If the order of bytes is inverted, that means that each component has |
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to be read big-endian. |
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@section Raw Audio |
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@multitable @columnfractions .4 .4 |
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@item ALAW @tab A-LAW |
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@item ULAW @tab MU-LAW |
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@item P<type><interleaving><bits> @tab little-endian PCM |
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@item <bits><interleaving><type>P @tab big-endian PCM |
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@end multitable |
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<type> is S for signed integer, U for unsigned integer, F for IEEE float |
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<interleaving> is D for default, P is for planar. |
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<bits> is 8/16/24/32 |
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@example |
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PFD[32] would for example be signed 32 bit little-endian IEEE float |
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@end example |
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@section Subtitles |
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@multitable @columnfractions .4 .4 |
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@item UTF8 @tab Raw UTF-8 |
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@item SSA[0] @tab SubStation Alpha |
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@item DVDS @tab DVD subtitles |
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@item DVBS @tab DVB subtitles |
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@end multitable |
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@section Raw Data |
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@multitable @columnfractions .4 .4 |
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@item UTF8 @tab Raw UTF-8 |
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@end multitable |
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@section Codecs |
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@multitable @columnfractions .4 .4 |
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@item 3IV1 @tab non-compliant MPEG-4 generated by old 3ivx |
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@item ASV1 @tab Asus Video |
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@item ASV2 @tab Asus Video 2 |
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@item CVID @tab Cinepak |
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@item CYUV @tab Creative YUV |
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@item DIVX @tab non-compliant MPEG-4 generated by old DivX |
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@item DUCK @tab Truemotion 1 |
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@item FFV1 @tab FFmpeg video 1 |
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@item FFVH @tab FFmpeg Huffyuv |
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@item H261 @tab ITU H.261 |
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@item H262 @tab ITU H.262 |
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@item H263 @tab ITU H.263 |
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@item H264 @tab ITU H.264 |
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@item HFYU @tab Huffyuv |
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@item I263 @tab Intel H.263 |
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@item IV31 @tab Indeo 3.1 |
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@item IV32 @tab Indeo 3.2 |
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@item IV50 @tab Indeo 5.0 |
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@item LJPG @tab ITU JPEG (lossless) |
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@item MJLS @tab ITU JPEG-LS |
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@item MJPG @tab ITU JPEG |
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@item MPG4 @tab MS MPEG-4v1 (not ISO MPEG-4) |
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@item MP42 @tab MS MPEG-4v2 |
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@item MP43 @tab MS MPEG-4v3 |
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@item MP4V @tab ISO MPEG-4 Part 2 Video (from old encoders) |
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@item mpg1 @tab ISO MPEG-1 Video |
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@item mpg2 @tab ISO MPEG-2 Video |
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@item MRLE @tab MS RLE |
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@item MSVC @tab MS Video 1 |
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@item RT21 @tab Indeo 2.1 |
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@item RV10 @tab RealVideo 1.0 |
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@item RV20 @tab RealVideo 2.0 |
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@item RV30 @tab RealVideo 3.0 |
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@item RV40 @tab RealVideo 4.0 |
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@item SNOW @tab FFmpeg Snow |
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@item SVQ1 @tab Sorenson Video 1 |
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@item SVQ3 @tab Sorenson Video 3 |
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@item theo @tab Xiph Theora |
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@item TM20 @tab Truemotion 2.0 |
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@item UMP4 @tab non-compliant MPEG-4 generated by UB Video MPEG-4 |
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@item VCR1 @tab ATI VCR1 |
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@item VP30 @tab VP 3.0 |
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@item VP31 @tab VP 3.1 |
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@item VP50 @tab VP 5.0 |
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@item VP60 @tab VP 6.0 |
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@item VP61 @tab VP 6.1 |
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@item VP62 @tab VP 6.2 |
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@item VP70 @tab VP 7.0 |
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@item WMV1 @tab MS WMV7 |
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@item WMV2 @tab MS WMV8 |
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@item WMV3 @tab MS WMV9 |
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@item WV1F @tab non-compliant MPEG-4 generated by ? |
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@item WVC1 @tab VC-1 |
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@item XVID @tab non-compliant MPEG-4 generated by old Xvid |
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@item XVIX @tab non-compliant MPEG-4 generated by old Xvid with interlacing bug |
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@end multitable |
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