User Manual

Optional MP4, H.264, H.265, VP9, or HEVC Controls
If you choose MP4 as the format, or QuickTime with H.264 or VP9 as the codec, additional
options appear, described below. Workstations using NVidia GPUs that offer NVENC will
present alternative accelerated options, while other workstations offering QuickSync hardware
encoding instead will be able to use that option.
 Use hardware acceleration if available: DaVinci Resolve supports QuickSync hardware
encoding of H.264 and HEVC, if available on your workstation.
 Quality: If the currently selected option in the Render to drop-down menu has options
for changing the compression quality, this drop-down menu lets you choose the quality
you want to use. Otherwise, it’s disabled.
 Restrict to X Kb/s: (Available for QuickTime H.264) You can choose Automatic, or
select a maximum data rate with which to export H.264.
 Encoding Profile: A drop-down that lets you choose among different encoding
profiles, each of which has been optimized for different purposes. The tradeoff is
between quality and computational intensity for encoding and playback. The available
options are:
–
Auto: Automatically selects an encoding profile.
–
Base: For H.264, intended for video conferencing and mobile phone use; highly
compressed.
–
Main: For H.264, intended for SD analog transmission. For H.265, intended for the
compression of 4:2:0 video at up to 4K 60fps with a bit depth of 8-bits per channel.
–
Main10: (H.265 only) Intended for the compression of 4:2:0 video at up to 4K 60fps
with a bit depth of 10-bits per channel.
–
High: For H.264, intended for Blu-Ray and HD transmission.
 Entropy Mode: (called Entropy Coding Mode for compatible Nvidia GPUs) A drop-down
that lets you choose which algorithm the encoder should use for compression.
The choices are:
–
CALVC (context-adaptive variable-length encoding): A lower-quality algorithm
that’s less computationally intensive to process and play.
–
CABAC (context-based adaptive binary arithmetic coding): A higher-quality
algorithm that yields better visual quality at lower bandwidth, at the cost of being
more computationally expensive to process and play.
 Multi-pass encode: (Available for QuickTime H.264) You can choose between
Single and Multi-pass encoding. Single pass is faster, but multi-pass yields superior
results when quality is important. When you enable Multi-pass, the number of passes
performed is automatic.
 Key Frames: (Available for QuickTime H.264) You can choose Automatic, or select a
duration for manual keyframe insertion.
 Frame Reordering: (Available for QuickTime H.264) On by default, Frame Reordering
enables the encoding of B frames to improve the quality of the resulting compressed
movie file. Turning off Frame Reordering will speed encoding performance at the
expense of visual quality.
 Rate Control: (Available for compatible Nvidia GPUs) Provides six options for controlling
Encoding Profile and Entropy Mode.
 Lookahead: (Available for compatible Nvidia GPUs) Lets you specify how many frames
for the encoder to examine in advance of compression.
Chapter – 166 Rendering Media 3439