blob: f9b18f566081df8d87c04d5d0674c7b47d9422b8
| 1 | \input texinfo @c -*- texinfo -*- |
| 2 | @documentencoding UTF-8 |
| 3 | |
| 4 | @settitle NUT |
| 5 | |
| 6 | @titlepage |
| 7 | @center @titlefont{NUT} |
| 8 | @end titlepage |
| 9 | |
| 10 | @top |
| 11 | |
| 12 | @contents |
| 13 | |
| 14 | @chapter Description |
| 15 | NUT is a low overhead generic container format. It stores audio, video, |
| 16 | subtitle and user-defined streams in a simple, yet efficient, way. |
| 17 | |
| 18 | It was created by a group of FFmpeg and MPlayer developers in 2003 |
| 19 | and was finalized in 2008. |
| 20 | |
| 21 | The official nut specification is at svn://svn.mplayerhq.hu/nut |
| 22 | In case of any differences between this text and the official specification, |
| 23 | the official specification shall prevail. |
| 24 | |
| 25 | @chapter Modes |
| 26 | NUT has some variants signaled by using the flags field in its main header. |
| 27 | |
| 28 | @multitable @columnfractions .4 .4 |
| 29 | @item BROADCAST @tab Extend the syncpoint to report the sender wallclock |
| 30 | @item PIPE @tab Omit completely the syncpoint |
| 31 | @end multitable |
| 32 | |
| 33 | @section BROADCAST |
| 34 | |
| 35 | The BROADCAST variant provides a secondary time reference to facilitate |
| 36 | detecting endpoint latency and network delays. |
| 37 | It assumes all the endpoint clocks are synchronized. |
| 38 | To be used in real-time scenarios. |
| 39 | |
| 40 | @section PIPE |
| 41 | |
| 42 | The PIPE variant assumes NUT is used as non-seekable intermediate container, |
| 43 | by not using syncpoint removes unneeded overhead and reduces the overall |
| 44 | memory usage. |
| 45 | |
| 46 | @chapter Container-specific codec tags |
| 47 | |
| 48 | @section Generic raw YUVA formats |
| 49 | |
| 50 | Since many exotic planar YUVA pixel formats are not considered by |
| 51 | the AVI/QuickTime FourCC lists, the following scheme is adopted for |
| 52 | representing them. |
| 53 | |
| 54 | The first two bytes can contain the values: |
| 55 | Y1 = only Y |
| 56 | Y2 = Y+A |
| 57 | Y3 = YUV |
| 58 | Y4 = YUVA |
| 59 | |
| 60 | The third byte represents the width and height chroma subsampling |
| 61 | values for the UV planes, that is the amount to shift the luma |
| 62 | width/height right to find the chroma width/height. |
| 63 | |
| 64 | The fourth byte is the number of bits used (8, 16, ...). |
| 65 | |
| 66 | If the order of bytes is inverted, that means that each component has |
| 67 | to be read big-endian. |
| 68 | |
| 69 | @section Raw Audio |
| 70 | |
| 71 | @multitable @columnfractions .4 .4 |
| 72 | @item ALAW @tab A-LAW |
| 73 | @item ULAW @tab MU-LAW |
| 74 | @item P<type><interleaving><bits> @tab little-endian PCM |
| 75 | @item <bits><interleaving><type>P @tab big-endian PCM |
| 76 | @end multitable |
| 77 | |
| 78 | <type> is S for signed integer, U for unsigned integer, F for IEEE float |
| 79 | <interleaving> is D for default, P is for planar. |
| 80 | <bits> is 8/16/24/32 |
| 81 | |
| 82 | @example |
| 83 | PFD[32] would for example be signed 32 bit little-endian IEEE float |
| 84 | @end example |
| 85 | |
| 86 | @section Subtitles |
| 87 | |
| 88 | @multitable @columnfractions .4 .4 |
| 89 | @item UTF8 @tab Raw UTF-8 |
| 90 | @item SSA[0] @tab SubStation Alpha |
| 91 | @item DVDS @tab DVD subtitles |
| 92 | @item DVBS @tab DVB subtitles |
| 93 | @end multitable |
| 94 | |
| 95 | @section Raw Data |
| 96 | |
| 97 | @multitable @columnfractions .4 .4 |
| 98 | @item UTF8 @tab Raw UTF-8 |
| 99 | @end multitable |
| 100 | |
| 101 | @section Codecs |
| 102 | |
| 103 | @multitable @columnfractions .4 .4 |
| 104 | @item 3IV1 @tab non-compliant MPEG-4 generated by old 3ivx |
| 105 | @item ASV1 @tab Asus Video |
| 106 | @item ASV2 @tab Asus Video 2 |
| 107 | @item CVID @tab Cinepak |
| 108 | @item CYUV @tab Creative YUV |
| 109 | @item DIVX @tab non-compliant MPEG-4 generated by old DivX |
| 110 | @item DUCK @tab Truemotion 1 |
| 111 | @item FFV1 @tab FFmpeg video 1 |
| 112 | @item FFVH @tab FFmpeg Huffyuv |
| 113 | @item H261 @tab ITU H.261 |
| 114 | @item H262 @tab ITU H.262 |
| 115 | @item H263 @tab ITU H.263 |
| 116 | @item H264 @tab ITU H.264 |
| 117 | @item HFYU @tab Huffyuv |
| 118 | @item I263 @tab Intel H.263 |
| 119 | @item IV31 @tab Indeo 3.1 |
| 120 | @item IV32 @tab Indeo 3.2 |
| 121 | @item IV50 @tab Indeo 5.0 |
| 122 | @item LJPG @tab ITU JPEG (lossless) |
| 123 | @item MJLS @tab ITU JPEG-LS |
| 124 | @item MJPG @tab ITU JPEG |
| 125 | @item MPG4 @tab MS MPEG-4v1 (not ISO MPEG-4) |
| 126 | @item MP42 @tab MS MPEG-4v2 |
| 127 | @item MP43 @tab MS MPEG-4v3 |
| 128 | @item MP4V @tab ISO MPEG-4 Part 2 Video (from old encoders) |
| 129 | @item mpg1 @tab ISO MPEG-1 Video |
| 130 | @item mpg2 @tab ISO MPEG-2 Video |
| 131 | @item MRLE @tab MS RLE |
| 132 | @item MSVC @tab MS Video 1 |
| 133 | @item RT21 @tab Indeo 2.1 |
| 134 | @item RV10 @tab RealVideo 1.0 |
| 135 | @item RV20 @tab RealVideo 2.0 |
| 136 | @item RV30 @tab RealVideo 3.0 |
| 137 | @item RV40 @tab RealVideo 4.0 |
| 138 | @item SNOW @tab FFmpeg Snow |
| 139 | @item SVQ1 @tab Sorenson Video 1 |
| 140 | @item SVQ3 @tab Sorenson Video 3 |
| 141 | @item theo @tab Xiph Theora |
| 142 | @item TM20 @tab Truemotion 2.0 |
| 143 | @item UMP4 @tab non-compliant MPEG-4 generated by UB Video MPEG-4 |
| 144 | @item VCR1 @tab ATI VCR1 |
| 145 | @item VP30 @tab VP 3.0 |
| 146 | @item VP31 @tab VP 3.1 |
| 147 | @item VP50 @tab VP 5.0 |
| 148 | @item VP60 @tab VP 6.0 |
| 149 | @item VP61 @tab VP 6.1 |
| 150 | @item VP62 @tab VP 6.2 |
| 151 | @item VP70 @tab VP 7.0 |
| 152 | @item WMV1 @tab MS WMV7 |
| 153 | @item WMV2 @tab MS WMV8 |
| 154 | @item WMV3 @tab MS WMV9 |
| 155 | @item WV1F @tab non-compliant MPEG-4 generated by ? |
| 156 | @item WVC1 @tab VC-1 |
| 157 | @item XVID @tab non-compliant MPEG-4 generated by old Xvid |
| 158 | @item XVIX @tab non-compliant MPEG-4 generated by old Xvid with interlacing bug |
| 159 | @end multitable |
| 160 | |
| 161 |