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John Dalberg
Guest
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 Posted:
Wed Jan 19, 2005 10:06 pm Post subject:
Jagged lines in moving scenes after converting to Divx.. why |
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I have a PVR which saves recording in Mpeg2 format. I then use
VirtualDubMob with Divx 5.2 Pro to encode them to Mpeg4. For some reason,
any scene that has fast movement of objects, these objects have big jagged
lines. I mean their border lines are jagged. What's the reason for that?
A setting in VD? The recordings look fine so I know that the conversion is
doing it.
--
John Dalberg
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Billy Joe
Guest
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| Posted:
Wed Jan 19, 2005 11:02 pm Post subject:
Re: Jagged lines in moving scenes after converting to Divx.. |
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John Dalberg wrote:
| Quote: | I have a PVR which saves recording in Mpeg2 format. I then use
VirtualDubMob with Divx 5.2 Pro to encode them to Mpeg4. For
some reason, any scene that has fast movement of objects,
these objects have big jagged lines. I mean their border
lines are jagged. What's the reason for that? A setting in
VD? The recordings look fine so I know that the conversion is
doing it.
--
John Dalberg
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Depends what you're viewing the xvids with???
H-250 PVR, for example, when capturing in NTSC is interlaced.
When converted to divx/xvid, some stand-alone (Philips DVP642,
for example) players do a piss poor job of displaying, even on
an NTSC TV. On the other hand, if you capture at a high bit
rate and deinterlace in a two pass conversion at a good bit
rate, even the Philips plays a decent picture.
Interlaced artifacts in divx/xvid encodings show up on digital
displays, where they would be largely unnoticed on raster TVs
(when played by good decoders). A deinterlaced, one pass
conversion will look noticeably better on raster than digital
displays. N pass and deinterlacing seems to me to be best, if
both display types might be used.
In my observations, the MPEG2 decoders handle interlace far
better than the divx/xvid decoders and you need to do some
testing for what works best in your specific environment (with
an eye to the future as to how your environment might change).
BJ |
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the dog from that film yo
Guest
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| Posted:
Wed Jan 19, 2005 11:56 pm Post subject:
Re: Jagged lines in moving scenes after converting to Divx.. |
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"John Dalberg" <john_dd@hotmail.com> wrote in message
news:1glxo5b6kl2oe$.gqvc5uso90nj.dlg@40tude.net...
| Quote: |
I have a PVR which saves recording in Mpeg2 format. I then use
VirtualDubMob with Divx 5.2 Pro to encode them to Mpeg4. For some reason,
any scene that has fast movement of objects, these objects have big jagged
lines. I mean their border lines are jagged. What's the reason for that?
A setting in VD? The recordings look fine so I know that the conversion is
doing it.
--
John Dalberg
|
sounds like you encoded it interlaced - this will actually give superior
picture quality if you are to watch it with the pc connected to your tv.
if you will be watching on the pc you need to turn on de-interlacing.
--
Gareth.
my Dad took me out for the evening and some girl was being a right
embarrassment
trying to get off with him, i had to pretend that i was his girlfreind
so that the stupid bitch would leave him alone, and we had a right
good laugh ahout it too.
'varizo' 26th Nov 04
http://www.audioscrobbler.com/user/dsbmusic/ |
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Christian Link
Guest
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| Posted:
Thu Jan 20, 2005 1:28 am Post subject:
Re: Jagged lines in moving scenes after converting to Divx.. |
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Hi, dog,
On Wed, 19 Jan 2005 18:56:51 -0000, "the dog from that film you saw"
<dsb@REMOVETHECAPITALSgarethyoung.plus.com> wrote:
| Quote: | sounds like you encoded it interlaced - this will actually give superior
picture quality if you are to watch it with the pc connected to your tv.
|
In the original poster's case, probably (assumed the material really was
interlaced, which I would agree it was), but not generally, as your
statement seems to suggest. If the material is actually progressive,
encoding it in interlace mode can rather make it look worse - even with
newer MPEG-2/4 encoders that do support interlaced encoding explicitly (less
efficient than encoding progressively, thus higher risk of getting artefacts
due to a lack of bitrate). Only encode video in interlace mode if it really
*is* interlaced, i. e. had a temporal resolution of 50/59.94 fields per
second. Otherwise, encode progressively, as your player will split the
decoded picture and output it field-wise if set-up for a standard TV,
anyway.
Greetings,
Chris. |
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