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. +
+ +NUT has some variants signaled by using the flags field in its main header. +
+| BROADCAST | Extend the syncpoint to report the sender wallclock |
| PIPE | Omit completely the syncpoint |
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. +
+ +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. +
+ +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. +
+ +| ALAW | A-LAW |
| ULAW | MU-LAW |
| P<type><interleaving><bits> | little-endian PCM |
| <bits><interleaving><type>P | big-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 +
| UTF8 | Raw UTF-8 |
| SSA[0] | SubStation Alpha |
| DVDS | DVD subtitles |
| DVBS | DVB subtitles |
| UTF8 | Raw UTF-8 |
| 3IV1 | non-compliant MPEG-4 generated by old 3ivx |
| ASV1 | Asus Video |
| ASV2 | Asus Video 2 |
| CVID | Cinepak |
| CYUV | Creative YUV |
| DIVX | non-compliant MPEG-4 generated by old DivX |
| DUCK | Truemotion 1 |
| FFV1 | FFmpeg video 1 |
| FFVH | FFmpeg Huffyuv |
| H261 | ITU H.261 |
| H262 | ITU H.262 |
| H263 | ITU H.263 |
| H264 | ITU H.264 |
| HFYU | Huffyuv |
| I263 | Intel H.263 |
| IV31 | Indeo 3.1 |
| IV32 | Indeo 3.2 |
| IV50 | Indeo 5.0 |
| LJPG | ITU JPEG (lossless) |
| MJLS | ITU JPEG-LS |
| MJPG | ITU JPEG |
| MPG4 | MS MPEG-4v1 (not ISO MPEG-4) |
| MP42 | MS MPEG-4v2 |
| MP43 | MS MPEG-4v3 |
| MP4V | ISO MPEG-4 Part 2 Video (from old encoders) |
| mpg1 | ISO MPEG-1 Video |
| mpg2 | ISO MPEG-2 Video |
| MRLE | MS RLE |
| MSVC | MS Video 1 |
| RT21 | Indeo 2.1 |
| RV10 | RealVideo 1.0 |
| RV20 | RealVideo 2.0 |
| RV30 | RealVideo 3.0 |
| RV40 | RealVideo 4.0 |
| SNOW | FFmpeg Snow |
| SVQ1 | Sorenson Video 1 |
| SVQ3 | Sorenson Video 3 |
| theo | Xiph Theora |
| TM20 | Truemotion 2.0 |
| UMP4 | non-compliant MPEG-4 generated by UB Video MPEG-4 |
| VCR1 | ATI VCR1 |
| VP30 | VP 3.0 |
| VP31 | VP 3.1 |
| VP50 | VP 5.0 |
| VP60 | VP 6.0 |
| VP61 | VP 6.1 |
| VP62 | VP 6.2 |
| VP70 | VP 7.0 |
| WMV1 | MS WMV7 |
| WMV2 | MS WMV8 |
| WMV3 | MS WMV9 |
| WV1F | non-compliant MPEG-4 generated by ? |
| WVC1 | VC-1 |
| XVID | non-compliant MPEG-4 generated by old Xvid |
| XVIX | non-compliant MPEG-4 generated by old Xvid with interlacing bug |
+ This document was generated using makeinfo. +
+