Grass Valley EDIUS Pro v.7.20 - Manual (Page 444)

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422 EDIUS - Reference Manual
[Extended Settings] tab
[Audio settings] [Format]
Select the audio compression format from the list.
[Channel]
Select from [Stereo], [Dual Channel] or [Joint Stereo]. [Stereo] is normal ste-
reo that records separately on the left and right sides. If there is a large differ-
ence between the left and right audio, compared to stereo that saves audio
with a greater focus on one side, [Dual Channel] records totally indepen-
dently so that there is no bias in sound quality to one side. Select to enter
narration in 2 languages, etc. [Joint Stereo] improves audio quality and com-
pression ratio when recording left and right audio separately by automatically
using a single channel that combines the audio when the left and right sides
are the same or one more channel when the left and right audio are different.
[Bit Rate]
Select a bitrate from the list.
[Video settings] [Field Order]
For interlace, a field order can be selected.
[Chroma Format]
Select a YUV pixel format from the list.
[Profile & Level]
Select a profile & level. If [Chroma Format] is [4:2:0] and [4:2:2], the profile
will be set to Main Profile and 422Profile, respectively. The level for SD
image quality will be Main Level, and the level for HD image quality will be
High Level. The profile & level changes according to the format selected in
[Chroma Format].
[GOP Structure]
For MPEG, a certain number of frames is considered as a group, and opera-
tions 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 sup-
ports GOP-based editing. Normally, leave this item unchecked.