MPEG1 to AVI conversion using AVIedit
MPEG is a file format by Motion Picture Experts Group. It compresses
video files effectively due to keyframe-based (temporal) compression,
producing VHS quality (for MPEG1). However it is unsuitable for editing and
currently suboptimal for both delivery and final production in comparison
to MPEG4 compressed avi files. Using AVIedit built-in MPEG1 to AVI converter
you can get both problems solved.
How do you run it? In AVIedit main menu, select MPEG converter.
You will see a dialog box window. You can either type in the source mpeg
file name manually, or drag and drop the file into this window, or
use browse button to select a file. Also you need to specify an
output avi file name.
Next optional step is, choose an appropriate video compressor.
There are a few pros & contras on this matter.
When you click Format button, a dialog box appears. The
drop-down list shows all available compressors. The set of installed
video codecs depends on your system settings and third-party software
that may add their proprietary codecs. Not all compressors can handle
any type of input video (frame width and height, color depth etc.)
and not all compressors will have their configuration dialog box
Use compression for...
Do not use & get...
- Smaller files
- Some quality loss
- Predictable video format
- Fewer extra steps if compressed for delivery or storage
- Conversion speed is lower
- Huge files
- No added quality loss
- Video may default to YUV colorspace instead of RGB
- Conversion runs faster
For simplicity, we choose Motion-JPEG compressor which is de-facto
standard for video editing.
Now your dialog box looks like the picture below and you're ready to go.
Sometimes you may wish to cut off a few beginning and ending frames
of your mpeg file. This can be done at the same run, if you fill in
optional selection fields and check in the box.
In the sample above, only the first 75 seconds of the source, starting
from 1 min 20 sec, will be converted and written to the output avi file.
Of course the written file will be much smaller than entire clip.
Finally you click Ok button and see the picture like one below.
Please note that dialog box will close automatically when conversion is done.
Progress bar might show some inaccuracy so please do not worry about that.
If conversion does not start (no hard drive activity) and no progress bar
steps visible, you're expected to read system messages area and try to solve
the problem. For example, if you try to write to read-only media like CD-ROM
or r/o network resource, change the file path and click Ok again. If
you can not determine why error occurs, you can send us an e-mail (please
copy the error messages you got, do not send screenshots, and give us all
possible information about your mpeg file).
Sometimes conversion stops early due to MPEG stream errors. Often this occurs
for broken downloaded mpegs. Generally, you can not fix the broken mpeg file
unless you have a chance re-download it new. However, using the selection
feature, you can convert the second piece of a file (past the time of broken
video frame or audio data) and then join the two avi pieces together using
(guess what?...) of course AVIedit ;)
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