On Wed, 16 Nov 2005, Geoffrey Hausheer wrote:
On 11/16/05, Cory Papenfuss wrote:
The "blockiness" is still present, though. Not really blockiness
as it is frame in != frame out. The .yuv files look like the original.
The I-frame inserted looks like it's encoded differently... like without
interlacing, and coarser quantization. I tried changing the c->qmax = 1
but had not discernable difference.
I can see it too, I'm just not sure what to do about it. Either I am
not setting up the encoder corrctly, or it can't process your streams
correctly, but in either case, I'm not sure how I can make it any
better. I'd recomend playing with ffmpeg. If you can find settings
that make the image look good there, I can incorporate them into the
encoder.
.Geoff
I have looked visually carefully at the .yuv, .yuv.enc, and output
mpeg with ffplay and I believe that the decode and encode are the same.
Once it's frame-frozen at the same generated I-frame in the output stream,
it looks different, however. Especially regarding the interlacing. Is it
possible that top/bottom fields got swapped once it got muxed in the
stream?
Another strange one. Doing basically nothing with a stream except
cleaning. It hangs towards the end at the same place (unbuffered
output at debug 4)
$mpeg2fix -d 4 -i cory_grad_luke_conf_alton.nuv -o test2.mpg
<the big snip>
VID: B #:12 nb: 2 pts: 609414887 dts: 609414887 pos: 8acd000
Id:0: 1:52:51.276 V:62669 3871 A:674123 8799
PTS discrepency: 609421373 != 609422669 on B-Type (14)
PTS discrepency: 609424621 != 609425672 on B-Type (15)
PTS discrepency: 609427864 != 609428675 on P-Type (16)
VID: P #:16 nb: 2 pts: 609427864 dts: 609419666 pos: 86a32b8
Id:0: 1:52:51.420 V:39117 3827 A:674123 8799
VID: B #:14 nb: 2 pts: 609421373 dts: 609421373 pos: 89213d8
Id:0: 1:52:51.348 V:11797 3783 A:674123 8799
When I ran it through gdb --args , 'run', it finished!
$ du -sk cory_grad_luke_conf_alton.nuv
4621744 cory_grad_luke_conf_alton.nuv
$ du -sk test2.mpg
3945220 test2.mpg
That's as far as it gets.
-Cory
--
*************************************************************************
* Cory Papenfuss *
* Electrical Engineering candidate Ph.D. graduate student *
* Virginia Polytechnic Institute and State University *
*************************************************************************
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