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HDV is a format for recording and playback of high-definition video on a DV cassette tape.

[edit] Specifications

The table below lists three HDV formats: HDV 720p, HDV 1080i and HDV 1080p, this is done for convenience only. HDV 1080p is not officially defined as a separate standard, but is included instead into HDV 1080i specification as optional format. All HDV camcorders that are capable of 1080p recording can also record native 1080i video.

Format HDV 720p HDV 1080i HDV 1080p
Media Full-size DV or compact Videotape#Camcorders|DVC cassette
Scanning type progressive interlaced progressive
Frame aspect ratio 16x9
Frame size in pixels 1280 x 720 1440 x 1080
Pixel aspect ratio 1.0 1.33
Video signal 720/60p, 720/30p, 720/50p, 720/25p, 720/24p 1080/60i, 1080/50i 1080/30p, 1080/25p, 1080/24p
Video Compression MPEG2 Video (profile & level: MP@H-14/HL) MPEG-2|MPEG2 Video (profile & level: MP@H-14)
Sampling frequency for luminance 74.25 MHz 55.6875 MHz
Chroma sampling format 4:2:0
Quantization 8 bits (both luminance and chrominance)
Compressed video bitstream rate ~19.7 Mbit/s ~25 Mbit/s
Compression MPEG-1 Audio Layer II, PCM MPEG-1 Audio Layer II
Sampling frequency 48 kHz
Quantization 16 bits
Audio modes and data rate Stereo (2-channel) at 384 kbit/s (192 kbit/s per channel);
optional 4-channel at 96 kbit/s per channel.
Stream type MPEG-2 transport stream (MPEG-2 TS)
Stream interface IEEE 1394 in alpha mode (also known as FireWire 400 or i.LINK)
File extension .m2t (generally)

[edit] Reference

  1. See Wikipedia [1]

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