AVC-Intra - Technical Details

Technical Details

There are two classes;

• AVC-Intra 50:
  • nominally 50 Mbit/s, size of each frame is fixed
  • CABAC entropy coding only.
  • 1920 × 1080 formats are High 10 Intra Profile, Level 4
  • 1280 × 720 formats are High 10 Intra Profile, Level 3.2
  • 4:2:0 chrominance sampling
  • frames are horizontally scaled by 3/4 (1920x1080 is scaled to 1440x1080. 1280 × 720 is scaled to 960x720)
• AVC-Intra 100:
  • nominally 100 Mbit/s, size of each frame is fixed
  • CAVLC entropy coding only.
  • All formats are High 4:2:2 Intra Profile, Level 4.1
  • 4:2:2 chrominance sampling
  • frames are not scaled

Common to both classes;

• Frame rates: 1920 × 1080 (23.98p / 25p / 29.97p / 50i / 59.94i), 1280 × 720 (23.98p / 25p / 29.97p / 50p / 59.94p)
• 10 bit luma and chroma

Panasonic implementation of AVC-Intra codec has following limitations: 8 × 8 transform only, 8 × 8 intra prediction only, 10 slices per picture, MBAFF for interlace material, custom quantization matrices for each class and each resolution.

• AVC-Ultra:

The Panasonic AVC-Ultra family defines an additional three new encoding parameters within the MPEG-4 Part 10 standard, utilizing up to the 4:4:4 Intra Predictive Profile, as well as an additional low bitrate proxy recording mode.

The most efficient new parameter within AVC-Ultra is by Panasonic called, AVC-LongG. AVC-LongG enables compression of video resolutions up to 1920 × 1080 @ 23.97, 25 and 29.97p, with 10 bits of pixel depth at 4:2:2 color sampling, at data rates as low as 25 Mbit / sec.

More over, the AVC-Intra Class 50/100 is now extended to Class 200 and Class 4:4:4. The Class 200 mode extends the bitrate to 226 Mbit / sec for 1080/23,97p, while the Class 4:4:4 extends the possible resolution from 720p to 4K with pixel depths at 10 and 12 bits.

The bitrate settings for Class 4:4:4 varies between 200 and 440 Mbit / sec depending on the resolution, frame rate and bit depth. Both the Class 200 and the Class 4:4:4 are Intra-only coding modes.

The AVC-Proxy mode enables extremely fast ENG content delivery and offline edits of 720p and 1080p video at bitrates varying between 800 Kbit to 3,5 Mbit / sec at 8 bits of pixel depth.