Tascam VS-R264 Reference Manual page 13

5 Keyframe Interval
i Seconds or frames can be used as the unit of length for the
keyframe interval.
Click this to open an option list.
Options: Seconds (default), Frames
i Set the length of the keyframe interval.
To set this, click the 5 and b buttons that appear when
the mouse is over the number or click the number and use
a keyboard for input.
Range
Seconds: 0.25 - 16.5 (default: 1) in 0.25 intervals
Frames: 3 - 1000
NOTE
i For recommended values, see the operation manual of the
RTMP destination.
i For low bit rate streaming, select a long interval.
6 Quality/Latency
Set the B frames per sub GOP for H.264.
Click this to open an option list.
Option Meaning
High 3 B frames per sub GOP
Normal (default) 2 B frames per sub GOP
Low 1 B frame per sub GOP
Lowest No B frames
NOTE
B frames have no effect with HEVC.
7 Video Encoding
i This sets the encoded video mode.
Click this to open an option list.
Options: H.264 (AVC) (default),
H.265 (HEVC) (VS-R265 only)
i Set the target bit rate to use in encoding.
To set this, click the 5 and b buttons that appear when
the mouse is over the number or click the number and use
a keyboard for input.
Range: 500 - 30000 kbps (default: 10000) in 1 kbps
intervals
The following table shows recommended bit rates.
Recommended video bit rates for H.264 (AVC)
Encoded Optimal bit rate
resolution (kbps)
3840x2160
1920x1080
1280x720
Recommended video bit rates for H.265 (HEVC) (VS-
R265 only)
Encoded Optimal bit rate
resolution (kbps)
3840x2160
1920x1080
1280x720
NOTE
When the Quality/Latency item is set to High, the same low-
quality bit rate is possible.
Highest quality
bit rate (kbps)
5000 14500
3000 8500
2500 7000
Highest quality
bit rate (kbps)
3000 10000
2000 7000
1500 5000
4 - Using Streaming Dashboard
8 H.264 Profile/H.265 Profile
Use this to set the profile for the video mode set by the Video
Encoding item.
Click this to open an option list.
H.264 Profile options:
High Profile, Main Profile, Baseline Profile
H.265 Profile options(VS-R265 only):
Main Profile
The H.264/H.265 level will be set automatically according to
the selected profile.
H.264 level: 3, 3.1, 3.2, 4, 4.1, 5.1
H.265 level: 3.1, 4, 4.1, 5, 5.1
NOTE
The H.264/H.265 level is set based on the settings of the
Video Scaling and Video Encoding items.
9 Audio Encoding
i Set the audio encoding type.
Option: MPEG-4 AAC-LC
i Set the audio encoding bit rate.
Options: 64 kbps, 96 kbps, 128 kbps (default), 192 kbps,
256 kbps, 320 kbps, 384 kbps, 512 kbps
After completing settings on this screen, click one of the buttons
below to save the settings.
o Click the button to save the settings and close the
settings screen.
o Click the button to save the settings.
NOTE
Click the button to close the settings screen without
saving the settings.
13
TASCAM VS-R264 / VS-R265