| Author |
Message |
Joe
Guest
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 Posted:
Tue Oct 05, 2004 5:45 am Post subject:
display size |
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I am using the format sdk to encode and write to file at 640x240, basically
taking a single NTSC field. I'd like to have this playback in windows media
player at 640x480 any time the file is viewed. Is there a way to muck with
the ASF header to trick Windows Media Player into doing this? I tried
changing the AspectRatioX and AspectRatioY attributes(1:2), but this
effectively makes the video display at 320x240. I tried changing the
WM/VideoWidth and WM/VideoHeight attributes to 640 and 480. No error occurs,
but the settings seem to be overwritten by the width and height set in the
profile. Note that the profile is set prior to setting these header
attributes prior to telling the writer to begin writing. I'm hoping this is
possible. I don't want to write a special reader/renderer and I don't want
to have to do anything special with windows media player or its plugin to
achieve this. Thanks.
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Becky Weiss [MS]
Guest
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| Posted:
Sat Oct 09, 2004 4:39 am Post subject:
RE: display size |
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Joe,
Is it possible for you to instead encode to a profile with 640x480? If so,
you can still input the frames as 640x240 (so long as you set the input media
type to indicate as much), and the WMFSDK Writer will automatically resize
your frames to 640x480 before encoding them. Whoever plays it back will of
course get 640x480. This may not be an option for you, though; I'm not sure
from your post.
Becky
This posting is provided AS IS with no warranties and confers no rights.
"Joe" wrote:
| Quote: | I am using the format sdk to encode and write to file at 640x240, basically
taking a single NTSC field. I'd like to have this playback in windows media
player at 640x480 any time the file is viewed. Is there a way to muck with
the ASF header to trick Windows Media Player into doing this? I tried
changing the AspectRatioX and AspectRatioY attributes(1:2), but this
effectively makes the video display at 320x240. I tried changing the
WM/VideoWidth and WM/VideoHeight attributes to 640 and 480. No error occurs,
but the settings seem to be overwritten by the width and height set in the
profile. Note that the profile is set prior to setting these header
attributes prior to telling the writer to begin writing. I'm hoping this is
possible. I don't want to write a special reader/renderer and I don't want
to have to do anything special with windows media player or its plugin to
achieve this. Thanks. |
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Joe
Guest
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| Posted:
Tue Oct 12, 2004 7:33 am Post subject:
RE: display size |
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Yes, I am aware of this. Thank you for the response though. The
stretch/resize happens before the video gets to the codec, right? So more
work is done(higher cpu usage) and probably more disk space for storage is
required, no? The cpu usage is the bigger issue for me as I am doing
multiple encodes simultaneously.
Thanks.
"Becky Weiss [MS]" wrote:
| Quote: | Joe,
Is it possible for you to instead encode to a profile with 640x480? If so,
you can still input the frames as 640x240 (so long as you set the input media
type to indicate as much), and the WMFSDK Writer will automatically resize
your frames to 640x480 before encoding them. Whoever plays it back will of
course get 640x480. This may not be an option for you, though; I'm not sure
from your post.
Becky
This posting is provided AS IS with no warranties and confers no rights.
"Joe" wrote:
I am using the format sdk to encode and write to file at 640x240, basically
taking a single NTSC field. I'd like to have this playback in windows media
player at 640x480 any time the file is viewed. Is there a way to muck with
the ASF header to trick Windows Media Player into doing this? I tried
changing the AspectRatioX and AspectRatioY attributes(1:2), but this
effectively makes the video display at 320x240. I tried changing the
WM/VideoWidth and WM/VideoHeight attributes to 640 and 480. No error occurs,
but the settings seem to be overwritten by the width and height set in the
profile. Note that the profile is set prior to setting these header
attributes prior to telling the writer to begin writing. I'm hoping this is
possible. I don't want to write a special reader/renderer and I don't want
to have to do anything special with windows media player or its plugin to
achieve this. Thanks. |
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