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- AVCHD VS HDV in video codec
- Video advantages in the AVCHD VS HDV format
- Luminance sampling of 1080 video in the AVCHD VS HDV
- AVCHD VS HDV in audio specs
- AVCHD VS HDV in editing
AVCHD video is a popular format for the recording and playback of high definition video on digital camcorders like Sony, Panasonic, Canon, JVC and Sanyo video camcorders. Generally AVCHD files are in.mts format on camcorder and in .m2ts after being transferred to computer.
AVCHD VS HDV in video codec
AVCHD uses MPEG-4 AVC/H.264 compression and encoding for video recording. HDV, on the other hand, uses MPEG-2 Main Profile @ High-1440.
Video advantages in the AVCHD VS HDV format
In an HD video, AVCHD format allows for 16:9 aspect ratio pictures with a raster size of 1920x1080 in addition to the HDV raster sizes of 1440x1080 and 1280x720. At the larger raster size, AVCHD can produce higher horizontal resolution than HDV. Plus, AVCHD recording supports 1080i/24/50/60, as well as 720p/24/50/60. Also AVCHD supports 16:9 and 4:3 SD raster sizes of 720x480 at 60i (NTSC) and 720x576 at 50i (PAL).
Luminance sampling of 1080 video in the AVCHD VS HDV
AVCHD has an advantage over HDV in luminance sampling of 1080 video. With the 1920x1080 raster, AVCHD uses a luminance sampling frequency of 74.25 MHz, compared to HDV's 55.7 MHz. In HDV, the higher luminance sampling frequency is reserved for its 720p recording modes, which may explain why 720p HDV can show higher horizontal resolution than 1080i HDV. When AVCHD is set to use the 1440x1080 raster, however, it appears that the standard requires the use of 55.7 MHz luminance sampling, and that will limit AVCHD's advantage solely to the superiority of H.264 encoding.
AVCHD VS HDV in audio specs
AVCHD calls for audio recording Dolby AC-3 for one channel or up to 5.1 channels, with data rates from 64 kbps to 640 kbps, or in PCM up to 7.1 at 1.5 Mbps per 2 channels. HDV is limited to two channels of audio compressed with MPEG-1 layer II to 384 kbps.
AVCHD VS HDV in editing
The AVCHD MPEG-4 H.264 format‘s recording media is flash ram so compression must be very high to fit affordable flash cards. H.264 is intended as a distribution format but can now be edited with recent consumer software and fast computers. Consumer software usually recodes h.264 to less demanding MPEG-2 so that typical dual core home computers can cope. This extra recode causes additional quality loss before final encoding for DVD or Blu-Ray. AVCHD can be used productively with higher end edit packages when converted to digital intermediate formats like Cineform or Apple Intermediate Codec. In summary, AVCHD requires more expensive edit gear and suffers greater loss in editing vs HDV.