On Sat, Oct 30, 2004 at 11:30:29PM +0200, Dik Takken wrote:
> Fact is that using MPlayer's post processing can make compressed
> material look better to the human spectator, but the question is
> still if an encoder like mpeg2enc will also like the post-processed
> stream better.
That's a question
On Sat, Oct 30, 2004 at 06:42:18PM +0200, Dik Takken wrote:
> I have done a bit of testing, comparing these two encoding
> pipelines:
>
> png images -> yuv4mpeg -> mjpeg -> mpeg2
>
> png images -> yuv4mpeg -> mpeg2
>
> The quality produced by the second pipeline is clearly a lot
> better. The mj
On Sat, 30 Oct 2004, Dik Takken wrote:
> Well, that was actually your suggestion. :) You suggested that the process
> of removing compression artifacts from yuv4mpeg data (caused by prior
> mjpeg compression) could best be done in the frequency domain. This makes
Oh, I guess it was -
On Sat, 30 Oct 2004, Steven M. Schultz wrote:
I should try using mplayer to feed the mjpeg file to mpeg2enc and see if
that yields a better mpeg2 stream. If that works, mpeg2enc could benefit
from the MPlayer pp filters as well.
I did try it now. I took a photograph and fed it to a script that
gen
On Sat, 30 Oct 2004, Steven M. Schultz wrote:
I should try using mplayer to feed the mjpeg file to mpeg2enc and see if
that yields a better mpeg2 stream. If that works, mpeg2enc could benefit
from the MPlayer pp filters as well.
Ummm, but mplayer's a _de_coder ;)
Exactly. :)
I guess I'm not
On Sat, 30 Oct 2004, Dik Takken wrote:
> I have done a bit of testing, comparing these two encoding pipelines:
>
> png images -> yuv4mpeg -> mjpeg -> mpeg2
>
> png images -> yuv4mpeg -> mpeg2
>
> The quality produced by the second pipeline is clearly a lot better. The
That is what is
On Fri, 29 Oct 2004, Steven M. Schultz wrote:
This is a task well suited for the various yuv* tools; yuvdenoise, yuvcorrect,
Hmmm, if it's "post encoding" processing you're talking about
would it be better to do that in the encoder rather than the
filtering the input stream prio
On Fri, 29 Oct 2004, Martin Samuelsson wrote:
> On Friday 29 October 2004 12:31, Dik Takken wrote:
> > This leads me to another question: Does lav2yuv do any postprocessing on
> > the MJPEG data to reduce compression artifacts?
>
> >This would make mpeg2enc's
> > job a bit easier. I know MPlaye
On Friday 29 October 2004 12:31, Dik Takken wrote:
> This leads me to another question: Does lav2yuv do any postprocessing on
> the MJPEG data to reduce compression artifacts?
As far as I know: None whatsoever. lav2yuv's purpose in this world is to
convert lav files into yuv files, nothing more.
On Thu, 28 Oct 2004, Matto Marjanovic wrote:
>STEP 2:
>
>I use lavtrans to 'grow' a new avi file by adding 'single_picture.avi' to
>itself and repeat that 100 times, like so (pseudo code):
...
Or,
cat picture.ppm | ppmtoy4m -n 100 -r -F 25:1 -I t -L | ...
That would work in this particular case, b
On Fri, 29 Oct 2004, Martin Samuelsson wrote:
A better strategy, albeit more space consuming, would be to convert them into
YUV4MPEG2 (if it still is called that nowadays; the raw YUV files produced by
lav2yuv) instead. If you have more CPU than disk, you could
convert-stream-and-feed-the-encoder v
[I have time for one easy question --- here's the easy answer:]
>have a bit of captured interlaced video and a ppm picture. I want to
>combine them into a single interlaced MPEG2 stream that looks like this:
...
>STEP 1:
...
>cat picture.ppm | ppmtoy4m -F 25000:1000 -I t -L | yuv2lav -f a
On Thursday 28 October 2004 23:00, Dik Takken wrote:
> In order to combine all of this into one MPEG2 stream, I start with
> converting all three components to MJPEG files. All three MJPEG files need
> to have the same resolution, interlacing and so on, or else lavtrans won't
> be able to merge the
The thread about interlaced vs progressive video quality contained a lot
of useful info about how to deal with progressive and interlaced video.
Now I want to try appying it do something useful, I hope. :) Suppose I
want to mix progressive and interlaced video material. For example, I
have a bi
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