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http://opencast.jira.com/browse/MH-8505?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=29253#comment-29253
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Adam McKenzie commented on MH-8505:
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Hi Kevin,
We have captured a math class where it was broadcast to another university
using skype and we didn't see any extra or lost time.
The default bitrate for the mpeg2 is 2000000. You can set it similarly to the
framerate i.e.:
capture.device.BT878_video__ProVideo_PV143_.bitrate=2000000
capture.device.Epiphan_VGA2USB.bitrate=2000000
It would decrease the load to decrease the bitrate. The range for bitrate is 0
- 18446744073709551615 and the default for gstreamer is 300000.
By default gstreamer uses constant bitrate for mpeg 2 (default pass value for
ffenc_mpeg2video is 0)
(0): cbr - Constant Bitrate Encoding
(2): quant - Constant Quantizer
(512): pass1 - VBR Encoding - Pass 1
(1024): pass2 - VBR Encoding - Pass 2
If you capture using:
capture.device.Epiphan_VGA2USB.type=EPIPHAN_VGA2USB
Do you have the same time discrepancy?
I have also fixed 1.3 so that the process of installing the epiphan driver can
work again if you wanted to give that a try.
When you do a test capture what is the CPU usage and load using top?
Thanks,
Adam
> Time length discrepancy in capture files due to dropped frames
> --------------------------------------------------------------
>
> Key: MH-8505
> URL: http://opencast.jira.com/browse/MH-8505
> Project: Matterhorn Project
> Issue Type: Bug
> Components: Capture (Devices and Software)
> Affects Versions: 1.2.1
> Reporter: Kevin Chan
> Assignee: Adam McKenzie
>
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