Displaying 20 results from an estimated 1000 matches similar to: "aspect ratio ?"
2007 Jan 06
7
FFmpeg Theora encoding patch
Hi,
Attached is my patch to add theora encoding to ffmpeg's libavcodec (by
using libtheora). I am requesting help to fix the bug I mention below
and am seeking general comments before I submit the patch properly.
Files encoded using this encoder have a problem playing in VLC. The
files will not play unless "Drop late frames" has been unticked in the
advanced video settings.
2008 Feb 29
1
Poor encoding quality with etheora and aspect ratio problem
Hello,
I wrote a theora video encoder based on etheora (and the examples
provided with it) for Processing IDE (processing.org). I have some
problem with the quality of encoded frames.
eg. http://poux.be/tmp/movie.ogg
And when I play the movie with mplayer or totem, the video resolution
is changed from 640x480 to 854x480 (when i use
ETHEORA_ASPECT_NORMAL in etheora_enc_setup). And if I try to
2004 Jun 29
6
Encoding theora...
Just trying to debug my theora encoder... just wondering if someone could
give me some insight on a few thigns...
In the yuv_buffer i'm sending in... i am just setting
y_stride = y_width = videoWidth
uv_stride = videoWidth/2
y_height = videoHeight
uv_height = videoHeight/2
Making the y buffer (width*height) and each of u and v (width*height/4)
Am i correct in doing this ? I knwo stride
2010 Jun 14
4
Live Stream Encoding
Hi There,
i want to stream some pictures out of my application using the Theora
codec. I can stream to a socket or a file. The current work based on the
png2theora example. Something while enconding went wrong: I can see the
whole video in VLC, but the complete duration of the file will not be
displayed. If i play the video in Firefox, the first 2 seconds will not
be played. I think the
2010 Mar 25
2
Questions about encoder parameters.
I have almost finished integration of Theora into our videoconferencing
program. Since a videoconferencing program is realtime, it is UDP-based
and wraps the Theora stream in RTP (More on that later). The problem
here is that most examples I could find, wraps the theora stream in ogg,
and used over tcp or files. I send over UDP and clients need to be able
to start in the middle of the stream.
2004 May 20
0
theora header bitmap for alpha3
below is an rfc-style bitmap of the initial theora header. I've checked
it against the spec and the code in libtheora; please double check :)
I'm posting it here for those implementing demux stages (which necessarily
don't use libtheora), and hence offering it for the spec. A typical
demux stage just needs to pick out the FRN, FRD and KFGSHIFT fields,
without going through the whole
2005 Sep 07
1
encoder settings
Hi!
Some background: I am trying to create an application that would
encode video taken by USB camera using Theora and then send it
to the client. I have almost succeeded, but I have one problem.
When I grab video frames from the camera and encode them they
form 4KB OGG pages, then I send them over TCP/IP to the client
application. Since I want to achieve as small latency as possible I
2009 Jul 08
2
Theora 1.1 rate controller
Hello everyone,
I'm currently developing an adaptive videoconferencing application based on
Ekiga which uses TFRC as a congestion control mechanism to adapt the video
encoding rate according to the quality of the network experienced. My goal
was to use the open-source Theora codec for video transmission.
Unfortunately, it seemed that Theora 1.0 did not properly implement any
correct CBR mode.
2004 Nov 20
0
ffmpeg2theora start and end time support
For last few days I was trying to learn ffmpeg and libtheora API. In the
process, I have modified ffmpeg2theora code to include support for start
time and end time.
ffmpeg2theora -s 60 -e 130 file.avi
will produce file.ogg which will be from 60th to 130th second of input
file (something like -ss and -endpos in mencoder). This is a useful
feature for someone who wants to cut a part of video
2006 Aug 06
2
paired t-test. Need to rearrange data?
Dear all,
I have received some data arranged like this:
# original data
id <- rep(letters[1:6], each=2)
time <- as.factor(rep(1:2, 6))
y <- as.vector(replicate(6, c(rnorm(n=1, mean=1), rnorm(n=1, mean=2))))
test.data <- data.frame(id, time, y)
test.data
I would like to perform a paired t-test of the y-values at time=1
against those at time=2, with samples paired by their id. Is it
2006 Aug 03
2
efficient way to make NAs of empty cells in a factor (or character)
Dear all,
I have some csv-files (originating from Excel-files) containing empty
cells. In my example file I have four variables of different classes,
each with some empty cells in the original csv-file:
> test <- read.csv2("test.csv", dec=".")
> test
id id2 x y
1 a 1 NA
2 b e NA 2.2
3 f 3 3.3
4 c g 4 4.4
> class(test$id)
[1]
2008 Apr 29
2
help text for xlim
Dear R-developers,
A student asked me today of how to specify the limits of the x-axis. I
knew that he should use xlim, but I tried to encourage him to have a try
himself with the various help functions. I do not judge if he used the
correct search strategy or right key words, but anyway here is what he
tried: he looked at ?plot. There xlim is not mentioned. He checked ?par.
There you find
2018 Nov 29
2
named arguments discouraged in `[.data.frame` and `[<-.data.frame`
Thanks Bill and Michael for taking the time to share your knowledge!
As a further background to my question, here are two examples that I forgot to include in my original post (reminded by Michael's answer). I swapped the i and j arguments in `[.data.frame` and `[<-.data.frame`. With warnings, but else without (?) problem. Using Bill's data:
`[.data.frame`(x = d, i = 1, j = 2)
# [1]
2011 Feb 15
1
Estimation of an GARCH model with conditional skewness and kurtosis
Hello,
I'm quite new to R but tried to learn as much as possible in the last
few months.
My problem is that I would like to estimate the model of Leon et al. (2005).
I have shortly summarised the most important equations in the following
pdf file:
http://hannes.fedorapeople.org/leon2005.pdf
My main question is now how could I introduce these two additional terms
into the Likelihood
2000 Sep 11
0
plots: aspect ratio
After playing around I got everything to work. One problem was
with the large pointsizes. I switched to small pointsizes and shrank the
plot region. This shrank the gaps and tick lengths down to reasonable
values.
As for aspect ratio, I think the pty="s" did finally kick in somehow. In
the old days this was not required; the dev.print width=, height= took
care of that.
Cheers,
Bill
2010 May 20
1
gpu scaling - aspect ratio issue
When I load an Infinity Engine game (in this case Baldur's Gate and Icewind Dale 2) I can't seem to get the aspect ratio to stick. If I set IWD2 to windowed it's fine, but if it's full screen it will either load as a window anyway or stick 1024x768 resolution into a 16:9 aspect ratio. I've fiddled with the nvidia control panel, but had no luck.
specs:
amd pII x4 955
gtx 260
2006 Aug 29
0
Small utility to modify Theora file aspect ratio / frame rate / cropping
Hello,
I encoded a bunch of theora video files from my DVDs. I thought for a long
time that mplayer was broken because it displayed the aspect ratio wrong.
Then I found out that the aspect ratio I was specifying was supposed to be
the pixel aspect ratio, not the video aspect ratio. (This is extremely
confusing and I urge you to change the semantics of encoder_example. I also
urge you to check for
2005 Jun 16
2
heatmap aspect ratio
Hi all,
Does anyone know of a fairly easy way to "stretch" a heatmap
vertically? I've got 42 arrays and would like to be able to see as
many significant genes as possible (right now I can only get 50 genes
with it still being readable). In some comparisons there are several
hundred significant genes.
I've fiddled with the "asp" argument, but that doesn't
2007 May 15
1
Getting default aspect ratio from lattice
How can I get the value of the aspect ratio that is used in a lattice
plot? In a levelplot for instance, the native units per cm of my x and
y axes are different, and I need to know the aspect ratio so that I can
correctly plot vectors. I know how to set the aspect in a high-level
lattice function but I can't quite figure out how to get it. I would
like call to levelplot() without printing
2007 Sep 09
1
Sweave figure aspect ratio
Hello,
using Sweave, is there any option to preserve the
original aspect ratio of plots generated from R code?
Consider this Sweave chunk:
<<test,echo=F,fig=T,width=2,height=2>>=
x <- 1:10
y <- sin(x)
par(mar=c(4,4,0,4))
plot(x,y,
xlab="x label",
ylab="y label"
)
@
In Latex, I want to produce a plot of width 2 but
don't care about the