Using ffmpeg.exe (under Windows) ,  I want to produce a 1280 by 720 pixel video  that combines half-height -cropped versions of  two video sources (input streams)  that are stacked atop one another.  One source is from a webcam, which is set to capture at 1280x720. I want to use the top half of that (top 360 of the 720 lines of vertical). video="Microsoft LifeCam HD-5000"  The other (2nd) source is from video="screen-capture-recorder"  -- I have read many threads online, found via web searches. I am very confused. I could use some hand-holding. I tried the new vstack filter. I don't need pad (padding). I can't find a simple example (command line) that matches what I am looking for.  I added  -vf "crop=1280:360:1280:360"  Maybe the first two values should be different ('0's , maybe ? ) .   I tried placing that portion of the command in different places, relative to the specifications of the input -f dshow -i "video=[...]".  I'm confused by map  (graph) stuff of ffmpeg.  "[0:v][1:v]vstack[v]" -map "[v]"  Once I am able to record video, I also want to combine with audio. Audio will be from a single source.  I have successfully made many videos using just screen/desktop capture + loopback audio using Windows Direct Show -- in which I record from only a single video source ...   e.g. :   ffmpeg.exe -f dshow -framerate 30 -i video="screen-capture-recorder":audio="virtual-audio-capturer" -filter_complex amix=inputs=1 -vcodec libx264 -pix_fmt yuv420p -preset ultrafast -acodec pcm_s16le (output file)     examples of commands that I have tried, and failed are :   ffmpeg -f dshow -i video="screen-capture-recorder" -f dshow -i video="Microsoft LifeCam HD-5000" -vf "crop=1280:360:1280:360" -filter_complex vstack -vcodec libx264 -pix_fmt yuv420p -preset ultrafast 5000screen_take1.mkv   I even tried adding :  "[0:v][1:v]vstack[v]" -map "[v]" to that , above (previous) command.
I need scale up video from one DOS game using . But with  on left side and  filter on the other one.  Input (320x200)    Output (1280x800)    Here is a command, where's xBR processing whole screen...  ffmpeg     -i input.avi     -sws_flags neighbor     -vcodec libx264 -strict -2     -preset veryslow -qp 0     -filter:v "xbr=4"     output.mp4
How to search for questions and answers between two users? I am searching for the questions posted by me (user:139150) that were answered by another user.    His ID is: 55159    There does not seem to be any way to search for posts where both the users are involved. Definite article — “on television” vs. “on the radio” Why are these different?        We heard the news on the radio.   We watched the news on television.      In this , the author says we must use television without the. Why? It makes me crazy. Is there a valid reason? As seen in this video: (Skip to 5:53)  When a player is slain, they drop an Enchanting Table on top of their inventory.  How was this achieved and how can I build a system (using command blocks) that does that? Come to think of it, what happens to a player's location when he/she dies? Does it reset to the spawnpoint? Stay the same (where they died) until they respawn? Or becomes a null value until they respawn? How to extend my root (/) partition? Hi I'm solving some exercise problems in my text : "A Course in Mathematical Statistics".  I'm in the chapter "Point estimation" now, and I want to find a UMVUE of $\theta$ where $X_1 ,...,X_n$ are i.i.d random variables with the p.d.f $f(x; \theta)=\theta e^{-\theta x}, x\gt0$.   I know that $E(X_i)=1/\theta,$ for each $i$, and also have that $\bar{X}$ (or equivalently $\sum_1^n X_i$) is a complete sufficient statistic for $\theta$. But I cannot go any further here. Somebody can help me? What are best practices for blocking UI when application is busy I'm writing a web app using Twitter Bootstrap with PHP on server side. My app makes regular ajax requests via jQuery and i want to disable certain parts of the UI until the server completes processing and hands back the control to Client-Side.  I wonder what would be best practices for the same? Submitting a URL to Google using PHP/cUrl I currently have the Geometry Dash lite version and I want to buy the full version. Can I login with my account of Geometry Dash lite and keep everything I already had? It would suck if I had to redo everything. I've read before that, by the Principle of Explosion, if a theory is inconsistent, then absolutely any statement can be proven within it.  Obviously, there are statements which are independent of ZFC (Continuum Hypothesis, etc). It seems to me that this proves that ZFC is incomplete. Why does it not then follow that ZFC is consistent? It seems to me that we could say "Assume ZFC is inconsistent. Then the the Continuum Hypothesis is provable in ZFC. But the Continuum Hypothesis is neither provable nor disprovable in ZFC. Therefore ZFC is consistent."  What am I missing here? Pacf lag axe , is not an integer I'm trying to use ARIMA process to predict the behaviour of a time series, the probleme I face is that I can't get the order of each component of ARIMA, the lag is between 0 and 1, same goes for the acf. The time series has no tendency, and I guess no seasonality.     My question is : Does this mean that ARIMA orders are all 0s, and if so, is the HoltWinters a good (or the best) solution for modelling this kind of TS ? In 10.04, I had a lot of keyboard shortcuts defined using Super/Mod4 and one single other key,   Super+O ran Opera Super+W opened Nautilus pointing to my Work folder, etc.   In 11.04, these do not seem to work -- only Super+R works to run the terminal, and Super+Shift+W successfully runs Nautilus.  Is there some way I can get these to function again?  Adding them in Keyboard Shortcuts does not work, and neither does adding commands in CompizConfig Settings Manager. Is there an unsubdivide function in Blender? I am wondering if there is a modifier or tool that will essentially undo a subsurf or subdivide command. I looking for help with proving the following inequality. Any relevant logarithmic identities would be great. Tried differentiating and taking limits and I'm lost as to how to approach this.   $$\frac 1{x+1}&lt;\ln\left(\frac{x+1}x\right)&lt;0.5\left(\frac 1x+\frac 1{x+1}\right)$$ How to show that all points are inside of unit circle? There are $n$ points on the plane. Any $3$ of them are inside of a unit circle. How to show that all points are inside of unit circle?  It is needed to prove that if there is a unit circle for each $3$  points which contains them, there is also a unit circle which contains all $n$ points. Practical way to implement prevention of IP Spoofing I am an undergraduate Computer Science student and was hoping to gain some knowledge of ways to help prevent IP spoofing but all the resources I have tried out elaborate this concept in a theoretical way. I want to try out my hands at one of the techniques like:      How do I simulate this whole situation in my own system were I myself am the attacker and I myself have to defend it? And once I have gained an understanding of it, then how do I start translating that into programming terms? What is the resolution of tapping a blocking creature? Let's say I have declared a blocker during the correct phase and during the activate abilities step I choose to tap the blocker to use its ability.  All the abilities resolve and now we move to the declare damage step.  I believe the resolution is that the attacking creature remains blocked and that it deals damage to my blocker; however, the blocker does not deal damage to the attacker.  How would this change if the blocker had first strike? How would this change if the blocker was sacrificed? Is there an international taxonomy of academic titles/ranks? Looking at the  on Wikipedia shows that the same academic rank/title can mean quite different things in different countries. For instant, a "research assistant" in the US can stand for an undergrad student doing an internship, while in the UK it can stand for a postdoc. Similarly, the term "lecturer" might stand for a permanent position (e.g. in the UK) or for a teaching assistant position, open to graduate students.   However, when thinking about it, there are not so many kind of possible positions (permanent or not, with teaching or not, with research or not, with PhD supervision or not, with team responsibility or not, etc), and having a clear title could help a lot (for instance, in my case, I've been working in four different countries, with a different job title each time!).    Is there some kind of official taxonomy that one could refer to?  If not, who could be in charge to create it? (the EU, if only for intra-Europe mobility?) I have encountered the definition of Cantor set and its property. Cantor set is constructed by removing the middle third open set of each interval .So each time we get some union of closed sets. As $F_0=[0,1]$ $F_1=[0,1/3]\cup [2/3,1]$ $F_2=[0,1/9]\cup [2/9,1/3]\cup [2/3,7/9]\cup [8/9,1]$ So on , That for $F_n$ we get the Union of $2^n$ closed interval . I know that finite union of closed interval is closed, but this is not true for arbitarly union. As I had a counterexample:  $\cup$ {{1/n}|for $n$ $\in N$} as this is not closed as $0$ is not in  that union. So what is the argument here to say that $F_n$ is closed for any $ n$ . As we are using this fact to prove the Cantor set to be closed as $F=\cap_{n\to \infty} F_n$ i.e arbitarly intersection of closed set is closed . Where am I misunderstanding? Any help will be appreciated. Let $I = \{a +ib \in \Bbb Z[i] : a$ and $b$ are both multiple of $5\}$. I'm running an SSH server on my personal computer. The log had many people(or bots?) repeatedly trying to log in to my server (that is before I changed the default port), which made me a little freaked out. I was worried about their dictionary attacks or brute force password guessing.  But then if you type wrong password (or wrong username), the server waits for about 2 seconds before it asks for password again. So an attacker can try one password per 2 seconds. So I concluded that these attacks aren't that great a threat (as long as your password does not consist of dictionary words.) Am I correct?