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File size of .avi with VirtualDub
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stampid
Newbie
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12. November 2009 @ 20:17 |
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I have taken a video with my canon camera.
Original file info:
video size: 640x480 @ 30 fps
Audio: 44100hz, 16bps, 1ch
Length: 2min44sec
bitrate: 15711kbps
Size on disk: 308MB
After processing it with VirtualDub, the file size on disk is 43MB. I think this is still huge.
Here are the settings I applied:
Video compression : Div 6.8.5 codec with full processing mode
Audio: 16 kbit/s, 8kh Mono: MPEG Layer 3 with full audio processing mode.
Is there a way to make this video to smaller size and keeping a decent quality close to the original.
Thanks for your help
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Senior Member
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12. November 2009 @ 21:07 |
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What bitrate or Q value did you set in the Divx encoder ?
Try setting it to Q=6 and see what you get. If it's still to big
set it to Q=8.
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stampid
Newbie
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16. November 2009 @ 20:49 |
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Hi,
I m not sure where to get this value.
Here's what I have.
I just tried converting a 145mb avi file from the camera to divx, and it gave me a 25mb file with those settings.
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Senior Member
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16. November 2009 @ 22:36 |
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Open the box where you see "rate control mode" and choose
1-pass quality based. Then put 6 in the box and use it as a
starting point.
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stampid
Newbie
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17. November 2009 @ 22:33 |
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Oh man,
this is getting pretty hard.
With your recommendations, I get a file 45.2MB
What's wrong ? Is there something wrong with the audio codec. I don t have lame installed, i m just using the mp3 the lowest in the list 1kb/sec ....
What to do ?
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Senior Member
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18. November 2009 @ 13:02 |
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Try encoding the file without the audio so you can get an idea
of the size. Select Audio - no audio.
You can try increasing the Q number and see what it does. Instead of 6,
use 10 - it should give a much smaller file.
An idea to gather more info is to open the resulting file in
Virtualdub and use file/file info.
Look at the video and audio bit-rates.
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stampid
Newbie
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18. November 2009 @ 22:17 |
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Here's the info from the converted file with sound.
and with no audio i still get the same size around 45MB.
Q = 6
What the hell is going on here.
Here's the screen when the video was processed.
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Senior Member
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18. November 2009 @ 22:54 |
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It's strange. For general usage, that range of Q values works quite
well. Your file info shows a bit rate of 4868 kbps. It's very high.
Try this . Open the Divx config box and hit "restore defaults".
In the bitrate box type 600. Encode the file.
What size do you get now? Check the bitrate in the file / file info to
see if's close to 600 (it should be)
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stampid
Newbie
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20. November 2009 @ 10:09 |
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Hello,
Here's the print screen of the video after the Restore to default settings
Now the file is around 22MB and with no sound. Ok. So it went down.
The bit rate is : 2956, which is very high.
I put the Q at 8 after and got a file with 45MB again.
How do i reduce the bitrate to 600 ?
Thanks
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Senior Member
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20. November 2009 @ 11:34 |
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I'm beginning to think there is something wrong with your Divx install.
Either reinstall it, or install Xvid and try that.
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stampid
Newbie
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20. November 2009 @ 18:47 |
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hello
it works
it made a file of 10.4MB with these settings
thx
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Senior Member
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22. November 2009 @ 21:11 |
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I looked at this again and saw something I didn't notice earlier.
You had "use presets to configure the encoder" checked. On mine,
it's grayed out, since I'm using the community codec (free version)
and that item is not unlocked.
I suspect if you deselect that option, you'll be able to set the
bit-rate accurately.
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