Sun . 19 Sep 2019

H.261

H.261 is a video compression standard. It was adopted in 1990 by the international organization ITU. It was originally designed for transmission over ISDN channels, in which data stream width is a multiple of 64 kilobits / s. The standard algorithm was designed to work with streams from 40 kilobits / s to 2 Megabits / s. The standard supported CIF and QCIF frame sizes with frame sizes of 352 × 288 and 176 × 144, respectively (and 4: 2: 0 by thinning the color components to 176 × 144 and 88 × 72). It was also modified (with backward compatibility) to transfer images with a 704 × 576 resolution (this extension was added around 1994).
Links
H.261 specification on ITU-T.
Media containers
Video / audio
3GP • ASF • AVI • Bink • DMF [en] • DPX [en] • EVO [en] • FLV • Matroska (MKV) • WebM • MPEG-PS [en] • MPEG-TS • MP4 • MXF • NUT [en] • Ogg • Ogg Media • QuickTime • RealMedia • Smacker • RIFF • VOB • Comparison • Compression
Audio
AIFF • APE • AU [en] • DSD • DXD • MLP • MP3 • FLAC • SHN [en] • WAV • WMA • Comparison • Compression
Music
MIDI (KAR) • Tracking Music
Graphic Formats (Compression)
Ras Third Lossless: BMP • FPX • GIF • ICO • ILBM • JBIG • PCX • PNG • PNM • PSD • Raw • TGA • WBMP • XCF • Including Lossy Compression: BPG • EXR • ICER • JBIG2 • JPEG / JP2 / JPEG-LS • JPEG XR (HD Photo) • PGF [en] • TIFF • WebP • Animation: APNG • GIF • MNG
Vector
AI • CDR • EMF • EPS • PS • SVG • WMF • XPS • Animation: SVG • SWF • 3D: 3DS • VRML • X3D
Comprehensive CGM • DjVu • PDF
Video Compression
ITU-T Recommendations
H.120 • H.261 • H.262 • H.263 • H.264 • H.265
ISO / IEC Standards
MJPEG • Motion JPEG 2000 • MPEG-1 • MPEG-2 • MPEG-4 (Part 2 / H.263 • Part 10 / H.264 / AVC) • MPEG-H Part 2 / H.265 / HEVC
SMPTE Standards
DV • VC-1 • VC-2 (Dirac Pro) • VC-3 (DNxHD) • VC-5 (CineForm)
MPEG-4 Codecs
3ivx • DivX • F Fmpeg • HDX4 • Nero Digital • Xvid • H.264 / AVC: CoreAVC • QuickTime • x264 • OpenH264
Lossless
CorePNG • FFV1 • Huffyuv • Lagarith • MSU Lossless • SheerVideo
Digital Cinema
CineForm • ProRes 422 • REDCODE
Other Codecs
Bink • Cinepak • Indeo • Pixlet • RealVideo • RTVideo • SIF1 • Smacker • Snow • Sorenson • Tarkin • VP3 (Theora) • VP6 • VP7 • VP8 • VP9 • WMV • x265 • Daala
See Also
Media Container • Graphic Formats • Image Compression
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H.261

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