|
Encoding Using Settings files
Your
Clipstream Video Premiere Plug-in comes with
pre-set settings files. Once Settings files have been installed
and/or created, it is very easy to create Clipstream Video
movies. All you need to do is the following:
- Open
a movie or movie project in Premiere.
- Under the File menu select Export>Movie.
- Click
Load; Select
one of the Clipstream Video pre-set settings files.
- Click OK; Click OK again.
- Name
the file with a .vcs extension and select where you would like
to save the file. Click
Save.
- Repeat
the process for each bitrate you wish to encode.
It is advisable to print out the Clipstream
Video Technical Guide document for easy reference while encoding.
In the case that the preset settings are not preferable, the Clipstream
Video Plug-in settings can be manually configured to adjust to
the exact desired specifications. Please follow the recommendations
below for more detailed information on how the settings interact.
Adjusting Plug-in Settings
There are many factors to consider when selecting
custom settings or deciding to load one of the pre-set Clipstream
Video Premiere Plug-in settings. The ability to play a movie
smoothly may need to be compromised to allow playback across a variety
of connections. Uploading and testing may need to be performed more
than once in order to arrive at an acceptable video for various
connection speeds.
Step-by-step:
- Edit the video in Premiere and then right click on the movie
and 'Get
Properties' (click to view). Take note of the Frame
Rate, Image size, and Audio Compressor (in case of QDesign
Music 2 in Quick Time or mpeg, audio may need to be down
sampled manually).
View
a Properties box Screenshot.
- When the video/project is ready to encode, go to File>Export>Movie
and a dialogue
box (click to view) will appear.
- Click on the Settings tab.
- For File type, select Clipstream Video movie from the
pull down menu or simply select
a pre-set settings file to get started.
- Take note of the Range; Choose 'Entire Clip' unless only a
specific portion of a project is desired. Uncheck 'Open when
Finished' if it is selected.
- Go to Video Settings.
In the Video Settings section, consider the Frame size
first with the following in mind:
- Try
to match the ratio of the source frame size to keep the same aspect.
Keep in mind that the larger the size, the poorer the quality
will have to be.
- 4:3
aspect is consistent with standard television size / 16:9 aspect
is common for films.
- For
larger frame dimensions, the quality and frame rate will need
to be lowered for a quality stream.
- To
avoid blocky artifacts in your *.vcs file, be sure to keep the
dimensions divisible by eight; even if it doesn't exactly
match the source file's aspect ratio.
- Frame
sizes will vary depending on the application. The chart below
is only a general guideline for reasonable frame sizes
at different connection speeds:
| Connection
speed |
28k
|
56k
|
100k
|
150k
|
200k
|
300k
|
500k
|
| Frame
size |
160x120
|
176x136
|
200x152
|
240x176
|
288x216
|
304x224
|
320x240
|
Now, in the same Video
Settings section, look at the Frame rate
- For faster
frame rates, the frame size and quality will need to be lowered
for a quality stream. High frame rates can affect CPU usage and
reduce playback quality on slower computers. We recommend a maximum
frame rate of 10 fps.
- To select
a frame rate that is not included in Premiere's default settings,
go to Video Settings, click 'Configure' and select the desired
setting in Frame Rate Adjustment. The specified frame rate can
be altered by selecting every second, third, etc. frame. Example;
to get a frame rate of 7.5fps, select 15fps and then Every Second
Frame in Frame Rate Adjustment.
- Playback
quality is occasionally smoother if the encoded file matches a
fraction of the source frame rate. For example, encode a 24FPS
file at 12fps, 8fps, 6fps, or 3fps for best results.
This is not essential.
- Guidelines
for reasonable frame rates for different connection speeds:
| Connection
speed |
28k
|
56k
|
100k
|
150k
|
200k
|
300k
|
500k
|
| Frame
rate |
.5
to 2
|
1
to 5
|
3
to 6
|
5
to 10
|
6
to 10
|
8
to 12
|
8
to 15
|
Quality
- The plug-in
will attempt to meet the Quality setting that you select for the
specified Data Rate. If the Quality setting cannot be met, the
plug-in will lower the setting automatically by as much as one
third. (the quality will generally fluctuate between your selected
setting and one third of that; minimum 5)
- Setting the
quality below 20 is not recommended but try to target a reasonable
Quality setting with the dimensions, frame rate and data rate
in mind.
- If the selected
quality is too high for the Data Rate to meet, the plug-in will
be forced to skip frames
- Here is a
general guideline for setting the quality:
| Connection
speed |
28k
|
56k
|
100k
|
150k
|
200k
|
300k
|
500k
|
| Quality
|
20
|
30
|
35
|
40
to 60
|
40
to 05
|
50-75
|
70-95
|
Data Rate
- The Data
Rate is selected with the viewers' anticipated connection speed
(bit rate) in mind.
- To figure
out the Data Rate:
-select a pre-set settings
file
- use this formula: Bit rate minus audio data rate divided by
8 equals data rate. Therefore, Data Rate and Audio Data Rate should
coincide with each other (example: for a 56k (real speed ~40kbps)
sample, if the audio data rate has been set at 16, the data rate
should be set to 4)
- Check here
for a Clipstream File Size Calculator.
The file size has a direct relationship to the Data Rate.
- The following
chart is a guide for data rates at different speeds:
| Connection
speed |
28k
|
56k
|
100k
|
150k
|
200k
|
300k
|
500k
|
| Data
rate |
2
or 1
|
4
or 5
|
10
|
16
|
22
|
37
or 32
|
58
|
| Audio
Data rate |
8
or 12
|
16
or 8
|
20
|
20
|
20
|
20
or 24
|
32
|
7 Now go to Audio
in the General Settings pull-down menu.
|