Grass Valley EDIUS Pro v.7.4 Reference Manual - Manual (Page 111)

Chapter 3 Edit Settings — External Device Management
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[Settings - Device Setting] Dialog Box (DirectShow Capture)
[Video Device] Displays the video capture devices connected to the system.
Click [Video Setting] to display detailed settings depending on your video capture device. For
more information on settings, see the manual for your device.
[Audio Device] Displays the audio capture device connected to the system.
Select the audio capture device corresponding to the video capture device from the list. To
cancel this setting, select [Not assigned].
[Set video frame rate from audio
sampling rate.]
Check this item to calculate the frame rate from the number of samples and duration time of the
audio. Uncheck this item to calculate the frame rate from the frame rate provided by the video
capture device, and convert the audio sampling rate to match the frame rate.
[Settings - Grass Valley HQ]/[Settings - Grass Valley HQX] Dialog Box
Codec settings [Online(SuperFine)]
This item can be selected for a Grass Valley HQX codec. This setting provides the highest
image quality, though the file size increases. Select this when importing at high image quality is
needed.
This item cannot be selected for a Grass Valley HQ codec.
[Online(Fine)]
This setting provides high image quality, though the file size increases. Select this when
importing at high image quality is needed.
[Online(Standard)]
Normally, you can get sufficient image quality at this setting.
[Offline]
Select this item to encode at a lower bitrate.
[Custom]
[Q] and [Max size] can be adjusted.
[Q] adjusts image quality. Set within the range 4 to 19 (0 to 18 in the case of a Grass Valley
HQX).Setting a smaller value results in higher image quality.
[Max size] sets the maximum bitrate. You can set to limit the file size that increases
inadvertently as a result of excessive noise in the video. Setting value “100” % means the same
bitrate before codec compression. For example, 100% for 1440x1080 59.94i is a bitrate of
approximately 750 Mbps. To set the upper limit to 200 Mbps, set “27” % as the maximum size.
3 Note
f The [Settings - Grass Valley HQ]/[Settings - Grass Valley HQX] dialog box shows the settings when importing video by Grass Valley
HQ/Grass Valley HQX capture. These are not the settings for Grass Valley HQ/Grass Valley HQX file export or for rendering when
Grass Valley HQ/Grass Valley HQX is selected in the project settings.
“Importing Sources from DV Tape (Capture)” (w page 140)
[Settings - MPEG2 Custom] Dialog Box
[Bit Rate] Select a bitrate type.
[CBR] sets a fixed transfer rate, allocating a fixed number of bits during the encoding process.
Select a bitrate from the [Average] list.
You can also enter a value directly.
[VBR] sets a variable transfer rate, altering the number of assigned bits according to the
complexity of the movement or image quality. Compared with [CBR], the media volume can be
used more efficiently, and this enables more consistent image quality overall. Select a bitrate
from the [Average] and [Max] lists. You can also enter a value directly.
[Quality/Speed] Select quality from the list.
[GOP Structure] For MPEG, a certain number of frames is considered as a group, and operations such as
compression/enlargement and cut editing are performed on a GOP basis. A GOP comprises
“I frame”, “P frame” and “B frame”. The I frame allows images to be reproduced independently,
the P frame is for recording and reproducing only the differences with the preceding image,
and the B frame reproduces images from the differences in the preceding and following
images. Select I, P and B frame patterns of the GOP from the list. Normally, select [IBBP].
[I-Frame Only] is comprised of only I-pictures. Editing is made easier, but the amount of data
increases in size.
[Picture count] Set the number of frames included in a group.
[Closed GOP] Check this item to complete information within each GOP. Although the amount of data
increases, the video can be re-edited using software that supports GOP-based editing.
Normally, leave this item unchecked.
[Chroma Format] Select a YUV pixel format from the list.