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• Use DivX settings to encode to mp4 with ffmpeg

  - by sjngm

  I'm used to use VirtualDub to encode a video to AVI container with DivX-codec (and MP3 for audio). Now I'm planning to use ffmpeg to encode videos to MP4 container with h264-codec. What I've figured out is that I need to use libx264 and one of those presets to make anything work. However, I'm amazed about the video bitrate ffmpeg uses for encoding. What I currently have is this little batch file: @ECHO OFF SETLOCAL SET IN=source.avs SET FFMPEG_PATH=C:\Program Files (x86)\ffmpeg SET PRESET=-fpre "%FFMPEG_PATH%\presets\libx264-lossless_slow.ffpreset" SET AUDIO=-acodec libmp3lame -ab 128000 SET VIDEO=-vcodec libx264 -vb 1978000 "%FFMPEG_PATH%\ffmpeg.exe" -i %IN% %AUDIO% %VIDEO% %PRESET% test.mp4 ENDLOCAL With this I tell ffmpeg to use 1978k as the bitrate, but ffmpeg uses 15000k+! I tried other presets, but they don't use my specified bitrate. Here are the presets I have: libx264-baseline.ffpreset libx264-ipod320.ffpreset libx264-ipod640.ffpreset libx264-lossless_fast.ffpreset libx264-lossless_max.ffpreset libx264-lossless_medium.ffpreset libx264-lossless_slow.ffpreset libx264-lossless_slower.ffpreset libx264-lossless_ultrafast.ffpreset ffmpeg version: FFmpeg git-N-29181-ga304071 libavutil 50. 40. 1 / 50. 40. 1 libavcodec 52.120. 0 / 52.120. 0 libavformat 52.108. 0 / 52.108. 0 libavdevice 52. 4. 0 / 52. 4. 0 libavfilter 1. 79. 0 / 1. 79. 0 libswscale 0. 13. 0 / 0. 13. 0 Note that I don't use the latest version as it has problems with spaces in filenames. Here's what seems to be the full parameter list DivX 6.9.2 uses: -bvnn 1978000 -vbv 218691200,100663296,100663296 -dir "C:\Users\sjngm\AppData\Roaming\DivX\DivX Codec" -w -b 1 -use_presets=1 -preset=10 -windowed_fullsearch=2 -thread_delay=1 What command line parameters would that be for ffmpeg? EDIT: Going with slhck's suggestion I tried a new 32-bit version. I have no idea if that is 0.9 or newer, I can't find that info. ffmpeg version N-36890-g67f5650 libavutil 51. 34.100 / 51. 34.100 libavcodec 53. 56.105 / 53. 56.105 libavformat 53. 30.100 / 53. 30.100 libavdevice 53. 4.100 / 53. 4.100 libavfilter 2. 59.100 / 2. 59.100 libswscale 2. 1.100 / 2. 1.100 libswresample 0. 6.100 / 0. 6.100 libpostproc 51. 2.100 / 51. 2.100 I reworked my batch file to look like this (interestingly enough I can't find parameter -vprofile in the documentation): @ECHO OFF SETLOCAL SET IN=VTS_01_1.avs SET FFMPEG_PATH=C:\Program Files (x86)\ffmpeg SET PRESET=-vprofile high -preset veryslow SET AUDIO=-acodec libmp3lame -ab 128000 SET VIDEO=-vcodec libx264 -vb 1978000 "%FFMPEG_PATH%\ffmpeg.exe" -i %IN% %AUDIO% %PRESET% %VIDEO% test.mp4 ENDLOCAL I see that it now uses the bitrate properly (thanks to LongNeckbeard for pointing out that the lossless-stuff ignores the bitrate!). Just in case you wonder how I came up with the 1978000, I'm using this formula which I found valid for DivX-files (I'm guessing the bitrate won't change that much for h264): width * height * 25 * 0.22 / 1000 I'm not sure if the 0.22 correlates with the CRF somehow. Overall I forgot to say the I will use a two-pass scenario, which is why I don't use the CRF here. I will try to read more about this. Currently I'm just trying to get something running that shows me that I'm doing something right (ffmpeg isn't the easiest tool to understand ;)). C:\Program Files (x86)\ffmpeg\ffmpeg.exe" -i VTS_01_1.avs -acodec libmp3lame -ab 128000 -vcodec libx264 -vb 1978000 -vprofile high -preset veryslow test.mp4 The output is now: ffmpeg version N-36890-g67f5650 Copyright (c) 2000-2012 the FFmpeg developers built on Jan 16 2012 21:57:13 with gcc 4.6.2 configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-runtime-cpudetect --enable-avisynth --enable-bzlib --enable-frei0r --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libfreetype --enable-libgsm --enable-libmp3lame --enable-libopenjpeg --enable-librtmp --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxavs --enable-libxvid --enable-zlib libavutil 51. 34.100 / 51. 34.100 libavcodec 53. 56.105 / 53. 56.105 libavformat 53. 30.100 / 53. 30.100 libavdevice 53. 4.100 / 53. 4.100 libavfilter 2. 59.100 / 2. 59.100 libswscale 2. 1.100 / 2. 1.100 libswresample 0. 6.100 / 0. 6.100 libpostproc 51. 2.100 / 51. 2.100 Input #0, avs, from 'VTS_01_1.avs': Duration: 00:58:46.12, start: 0.000000, bitrate: 0 kb/s Stream #0:0: Video: rawvideo (YV12 / 0x32315659), yuv420p, 576x448, 77414 kb/s, 25 tbr, 25 tbn, 25 tbc Stream #0:1: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 48000 Hz, 2 channels, s16, 1536 kb/s File 'test.mp4' already exists. Overwrite ? [y/N] y w:576 h:448 pixfmt:yuv420p tb:1/1000000 sar:0/1 sws_param: [libx264 @ 05A2C400] using cpu capabilities: MMX2 SSE2Fast FastShuffle SSEMisalign LZCNT [libx264 @ 05A2C400] profile High, level 3.1 [libx264 @ 05A2C400] 264 - core 120 r2120 0c7dab9 - H.264/MPEG-4 AVC codec - Copyleft 2003-2011 - http://www.videolan.org/x264.html - options: cabac=1 ref=16 deblock=1:0:0 analyse=0x3:0x133 me=umh subme=10 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=24 chroma_me=1 trellis=2 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=3 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=8 b_pyramid=2 b_adapt=2 b_bias=0 direct=3 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=25 scenecut=40 intra_refresh=0 rc_lookahead=60 rc=abr mbtree=1 bitrate=1978 ratetol=1.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00 Output #0, mp4, to 'test.mp4': Metadata: encoder : Lavf53.30.100 Stream #0:0: Video: h264 (![0][0][0] / 0x0021), yuv420p, 576x448, q=-1--1, 1978 kb/s, 25 tbn, 25 tbc Stream #0:1: Audio: mp3 (i[0][0][0] / 0x0069), 48000 Hz, 2 channels, s16, 128 kb/s Stream mapping: Stream #0:0 -> #0:0 (rawvideo -> libx264) Stream #0:1 -> #0:1 (pcm_s16le -> libmp3lame) Press [q] to stop, [?] for help frame= 0 fps= 0 q=0.0 size= 0kB time=00:00:00.00 bitrate= 0.0kbits/s frame= 0 fps= 0 q=0.0 size= 0kB time=00:00:00.00 bitrate= 0.0kbits/s frame= 0 fps= 0 q=0.0 size= 0kB time=00:00:00.00 bitrate= 0.0kbits/s frame= 3 fps= 1 q=22.0 size= 39kB time=00:00:00.04 bitrate=8063.8kbits/ frame= 8 fps= 2 q=22.0 size= 82kB time=00:00:00.24 bitrate=2801.3kbits/ frame= 13 fps= 3 q=23.0 size= 120kB time=00:00:00.44 bitrate=2229.5kbits/ frame= 16 fps= 4 q=23.0 size= 147kB time=00:00:00.56 bitrate=2156.7kbits/ frame= 20 fps= 4 q=22.0 size= 175kB time=00:00:00.72 bitrate=1987.4kbits/ : video:4387kB audio:273kB global headers:0kB muxing overhead 0.260038% [libx264 @ 05A2C400] frame I:2 Avg QP:19.53 size: 29850 [libx264 @ 05A2C400] frame P:76 Avg QP:22.24 size: 19541 [libx264 @ 05A2C400] frame B:359 Avg QP:25.93 size: 8210 [libx264 @ 05A2C400] consecutive B-frames: 0.5% 0.5% 0.0% 8.2% 17.2% 52.2% 16.0% 5.5% 0.0% [libx264 @ 05A2C400] mb I I16..4: 5.4% 75.3% 19.3% [libx264 @ 05A2C400] mb P I16..4: 1.3% 16.5% 2.2% P16..4: 36.3% 28.6% 12.7% 1.8% 0.2% skip: 0.4% [libx264 @ 05A2C400] mb B I16..4: 0.4% 3.8% 0.3% B16..8: 40.0% 18.4% 4.7% direct:18.5% skip:13.9% L0:45.4% L1:38.1% BI:16.5% [libx264 @ 05A2C400] final ratefactor: 20.35 [libx264 @ 05A2C400] 8x8 transform intra:83.1% inter:68.5% [libx264 @ 05A2C400] direct mvs spatial:99.2% temporal:0.8% [libx264 @ 05A2C400] coded y,uvDC,uvAC intra: 64.9% 83.4% 49.2% inter: 49.0% 50.4% 4.4% [libx264 @ 05A2C400] i16 v,h,dc,p: 25% 22% 27% 26% [libx264 @ 05A2C400] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 10% 7% 23% 9% 10% 10% 10%10% 13% [libx264 @ 05A2C400] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 12% 11% 13% 9% 12% 11% 10% 9% 12% [libx264 @ 05A2C400] i8c dc,h,v,p: 42% 28% 16% 14% [libx264 @ 05A2C400] Weighted P-Frames: Y:18.4% UV:7.9% [libx264 @ 05A2C400] ref P L0: 29.1% 11.3% 15.7% 7.3% 6.9% 4.9% 5.1% 3.4%3.9% 2.7% 2.8% 1.8% 1.7% 1.2% 1.4% 0.9% [libx264 @ 05A2C400] ref B L0: 68.8% 11.4% 5.5% 2.9% 2.3% 1.9% 1.5% 1.1%1.1% 1.0% 0.9% 0.7% 0.5% 0.3% 0.1% [libx264 @ 05A2C400] ref B L1: 91.9% 8.1% [libx264 @ 05A2C400] kb/s:2055.88 As far as I'm concerned it doesn't look that bad to me.

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• Differences & Similarities Between Programming Paradigms

  - by DaveDev

  Hi Guys I've been working as a developer for the past 4 years, with the 4 years previous to that studying software development in college. In my 4 years in the industry I've done some work in VB6 (which was a joke), but most of it has been in C#/ASP.NET. During this time, I've moved from an "object-aware" procedural paradigm to an object-oriented paradigm. Lately I've been curious about other programming paradigms out there, so I thought I'd ask other developers their opinions on the similarities & differences between these paradigms, specifically to OOP? In OOP, I find that there's a strong focus on the relationships and logical interactions between concepts. What are the mind frames you have to be in for the other paradigms? Thanks Dave

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• WPF - Dispatcher PushFrame()

  - by Tri Q

  Hello, I'm trying to call Dispatcher.PushFrame() from several different thread but encounter an error: Must create DependencySource on same Thread as the DependencyObject. Here is a code snippet: _lockFrame = new DispatcherFrame(true); Dispatcher.PushFrame(_lockFrame); When I tried: Dispatcher.CurrentDispatcher.Invoke( DispatcherPriority.Normal, new Action(() => _lockFrame = new DispatcherFrame(true)); Dispatcher.PushFrame(_lockFrame); I get the error: Objects must be created by the same thread. What is the approach for pushing multiple frames into the Dispatcher from different threads?

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• Do PHP Framworks Speed Up the Development Process?

  - by Jacob

  I recently started working for a web firm as a freelancer taking my hobby of coding in PHP to a career level, and since then I have been overwhelmed by the amount of work that needs to be done within short time frames. The problem isn't being able to do what is asked, but being able to do it all as quickly as is needed of me. I never used any PHP frameworks, but if I started using one, would that speed up the entire development process? If so, how drastically? Also which framework would be best for my purpose? If it matters, what I do is mostly build back end cms's and tie that with front end functionality for small business client sites.

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• Breakpoints not working in Delphi 6 DirectShow source filter

  - by Robert Oschler

  I'm trying to debug my DirectShow source filter. I'm using Delphi Pro 6 on Windows XP along with the DSPACK component library. I'm using Skype as my host application, which I set in the Parameters option in the Run menu, for testing my source filter DLL (ax file extension). Skype runs fine and I see a stream of my OutputDebugString messages in the Event Viewer, but none of my breakpoints are ever hit. In my Project Settings I have optimizations off, stack frames on, debug DCUs on, Range Checking on, and Overflow checking on. Each time I modify my code and run a test I: Do a full build Unregister the DirectShow filter (regsvr32 /u) Register the DirectShow filter (regsvr32) Run Skype as my Host application from the IDE When an Exception occurs, the IDE does trap it and pops up an error dialog box with the option to view the assembler code in the CPU window. However none of my breakpoints are being hit. Can anyone tell me how to get breakpoints working? Thanks.

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• How to make HTML div follow its page position while scrolling?

  - by Ole Jak

  So I have a page like this you look at. On top I have some special informative div (here it contains something like links to | logout | about | faq | search ). I want on page scrolling (down) that div follow page like it stands above it. I want it to work in IE 5,6,7,8,9 and FF 1.5 and above. How to solve such problem? If your answer contains JS it shall be libs (like jQuery) independent. If html - No frames, Iframes

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• Android: How to save a preview frame as jpeg image?

  - by niko

  Hi, I would like to save a preview frame as a jpeg image. I have tried to write the following code: public void onPreviewFrame(byte[] _data, Camera _camera) { if(settings.isRecording()) { Camera.Parameters params = _camera.getParameters(); params.setPictureFormat(PixelFormat.JPEG); _camera.setParameters(params); String path = "ImageDir" + frameCount; fileRW.setPath(path); fileRW.WriteToFile(_data); frameCount++; } } but it's not possible to open a saved file as a jpeg image. Does anyone know how to save preview frames as jpeg images? Thanks

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• Video loads but doesn't play with MPMoviePlayerController in iPad

  - by hgpc

  I'm using MPMoviePlayerController to play videos in an iPad app. Everything works well on the iPad simulator. On an actual device, the videos load but don't play, even if I press the play button. I can move the slider and see different frames of the video, but it never plays. I'm using the following code: moviePlayer = [[MPMoviePlayerController alloc] init]; moviePlayer.shouldAutoplay = YES; moviePlayer.contentURL = video.urlVideo; moviePlayer.view.frame = videoPlayerContainer.bounds; moviePlayer.view.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight; [videoPlayerContainer addSubview:moviePlayer.view]; moviePlayer.controlStyle = MPMovieControlStyleEmbedded; [moviePlayer play]; Help?

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• Easy GWT Animations

  - by brad

  I've started looking at some external GWT libraries for animations, but they all seemd a bit overkill for what i want. I'm trying to mimic JQuery Tools scrollabel plugin in GWT for a scrolling navigation (think iphone). User clicks an item, page scrolls to the child panel of that item, which may also have children that can be clicked. All I need to do is slide a div, x number of pixels backwards and forwards over some fixed rate of time The only real tutorial i've found on writing animations in GWT is 2 years old and seems a bit verbose, (managing individual frames etc...) Is there no simpler solution for easily moving a div from one position to another without requiring all the extra cruft? Forgive me but I'm coming from jQuery coding that has this built in simply and easily.

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• Is recursion ever faster than looping?

  - by Carson Myers

  I know that recursion is sometimes a lot cleaner than looping, and I'm not asking anything about when I should use recursion over iteration, I know there are lots of questions about that already. What I'm asking is, is recursion ever faster than a loop? To me it seems like, you would always be able to refine a loop and get it to perform more quickly than a recursive function because the loop is absent constantly setting up new stack frames. I'm specifically looking for whether recursion is faster in applications where recursion is the right way to handle the data, such as in some sorting functions, in binary trees, etc.

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• Why isn't TextBox.Text in WPF animatable?

  - by cplotts

  Ok, I have just run into something that is really catching me off-guard. I was helping a fellow developer with a couple of unrelated questions and in his project he was animating text into some TextBlock(s). So, I went back to my desk and recreated the project (in order to answer his questions), but I accidentally used TextBox instead of TextBlock. My text wasn't animating at all! (A lot of help, I was!) Eventually, I figured out that his xaml was using TextBlock and mine was using TextBox. What is interesting, is that Blend wasn't creating key frames when I was using TextBox. So, I got it to work in Blend using TextBlock(s) and then modified the xaml by hand, converting the TextBlock(s) into TextBox(es). When I ran the project, I got the following error: InvalidOperationException: '(0)' Storyboard.TargetProperty path contains nonanimatable property 'Text'. Well, it seems as if Blend was smart enough to know that ... and not generate the key frames in the animation (it would just modify the value directly on the TextBox). +1 for Blend. So, the question became: why isn't TextBox.Text animatable? The usual answer is that the particular property you are animating isn't a DependencyProperty. But, this isn't the case, TextBox.Text is a DependencyProperty. So, now I am bewildered! Why can't you animate TextBox.Text? Let me include some xaml to illustrate the problem. The following xaml works ... but uses TextBlock(s). <Window xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" x:Class="TextBoxTextQuestion.MainWindow" x:Name="Window" Title="MainWindow" Width="640" Height="480" > <Window.Resources> <Storyboard x:Key="animateTextStoryboard"> <StringAnimationUsingKeyFrames Storyboard.TargetProperty="(TextBlock.Text)" Storyboard.TargetName="textControl"> <DiscreteStringKeyFrame KeyTime="0:0:1" Value="Goodbye"/> </StringAnimationUsingKeyFrames> </Storyboard> </Window.Resources> <Window.Triggers> <EventTrigger RoutedEvent="FrameworkElement.Loaded"> <BeginStoryboard Storyboard="{StaticResource animateTextStoryboard}"/> </EventTrigger> </Window.Triggers> <Grid x:Name="LayoutRoot"> <StackPanel Orientation="Vertical" HorizontalAlignment="Center" VerticalAlignment="Center"> <TextBlock x:Name="textControl" Text="Hello" FontFamily="Calibri" FontSize="32"/> <TextBlock Text="World!" Margin="0,25,0,0" FontFamily="Calibri" FontSize="32"/> </StackPanel> </Grid> </Window> The following xaml does not work and uses TextBox.Text: <Window xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" x:Class="TextBoxTextQuestion.MainWindow" x:Name="Window" Title="MainWindow" Width="640" Height="480" > <Window.Resources> <Storyboard x:Key="animateTextStoryboard"> <StringAnimationUsingKeyFrames Storyboard.TargetProperty="(TextBox.Text)" Storyboard.TargetName="textControl"> <DiscreteStringKeyFrame KeyTime="0:0:1" Value="Goodbye"/> </StringAnimationUsingKeyFrames> </Storyboard> </Window.Resources> <Window.Triggers> <EventTrigger RoutedEvent="FrameworkElement.Loaded"> <BeginStoryboard Storyboard="{StaticResource animateTextStoryboard}"/> </EventTrigger> </Window.Triggers> <Grid x:Name="LayoutRoot"> <StackPanel Orientation="Vertical" HorizontalAlignment="Center" VerticalAlignment="Center"> <TextBox x:Name="textControl" Text="Hello" FontFamily="Calibri" FontSize="32"/> <TextBox Text="World!" Margin="0,25,0,0" FontFamily="Calibri" FontSize="32"/> </StackPanel> </Grid> </Window>

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• known memory leaks in 3ds max?

  - by Denise

  I've set up a script in 3ds max to render a bunch of animations into frames. To do this, I open up a file with all of the materials, load an animation (as a bip) onto the figure, then render. We were seeing a problem where eventually the script would fail because it was unable to open the next file-- max had consumed all of the system memory. Closing max, of course, freed the memory, and we were able to continue with the script. I checked out the heapfree variable, hoping to see a memory leak within my script, hoping to see a memory leak within my own (maxscript) code-- but the amount of free space was the same after every animation. Then, it must be 3ds max which is consuming all of that memory. Nothing in max need be saved from animation to animation-- is there some way to get max to free that memory? (I've tried resetMaxFile() and manually deleting all of the objects in the scene). Is there any known sets of operations that cause max to grow out of control?

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• What's viewport mean to the jQuery guys?

  - by justSteve

  I came here intent on asking a 'how do i' type question focused on a particular UI problem i have to solve and i started using the term 'viewport'. Seems there's lots of contexts that tag evokes. Before i outline mine i should ask - is there a generally recognized consensus as to what a 'viewport' is? Any gallery or object browser that focuses on a UI principle where multiple frames/panes show feeds of different graphs where each feed might be a complex grid/graph? I'm imagining something where my page may open with a half dozen different grids (tabular data) stay updated via ajax interactions with various servers. UI elements provide control scale up or down a given grid with a quasi accordion slide kinda thingie. For example, one click on a scale up-or-down control would rescale the other viewports in the opposite direction. More clicks - more pronounced effect. So my 'how do i' question morphs into a 'how have others...' thx

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• Deeplinking using GWT History Token within a Facebook iFrame Canvas

  - by Stevko

  I would like to deep link directly to a GWT app page within a Facebook iFrame Canvas. The first part is simple using GWT's History token with URLs like: http://www.example.com/MyApp/#page1 which would open page1 within my app. Facebook Apps use an application url like: http://apps.facebook.com/myAppName which frames my Canvas Callback URL http://www.example.com/MyApp/ Is there a way to specify a canvas callback url (or bookmark url) which will take the user to a specific page rather than the index page? Why? you may ask. Besides all the benefits of deep links... I want the "Go To Application" url to take users to an index page w/ marketing material (the canvas callback url) I want the "Bookmark URL" to take (likely returning) users to a login page and bypass downloading the marketing content (and that huge SWF file).

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• Autoresizing subclassed UITableViewCell subviews

  - by JustinXXVII

  I've subclassed UITableViewCell and incorporated some subviews via the layoutSubviews method. All views are allocated and initiated in the initWithStyle method, and frames are set in the layoutSubviews method, like so: initWithStyle:... { UILabel *myLabel = [[UILabel alloc] initWithFrame:CGRectZero]; myLabel.someProperties = Configured; [self.contentView addSubview:myLabel]; layoutSubviews { CGRect labelRect = CGRectMake(10.0f, 5.0f, 35.0f, 180.0f); myLabel.frame = labelRect; Setting the shouldAutoRotateOrientation to YES in the viewController rotates the NavigationController, tableView and UIToolbar appropriately, but the contents of the tableViewCells don't move. I'm not clear on where or what to add as far as AutoResizingMasks. The combinations I've tried so far haven't done anything. Can someone give me a hand? Thanks!

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• Loading a image and copying the metadata of a jpeg image.

  - by Ravi shankar

  I am trying to load a jpeg image and trying to copy metadata to new image, but the new image is created with out any metadata. Can some one help me out in solving above problem. I am using C++ CLI 3.5. if (System::IO::Stream ^jpegStreamIn = File::Open(FileMyPictures, FileMode::Open, FileAccess::ReadWrite, FileShare::None)) { decoder = gcnew System::Windows::Media::Imaging::JpegBitmapDecoder(jpegStreamIn, System::Windows::Media::Imaging::BitmapCreateOptions::PreservePixelFormat, System::Windows::Media::Imaging::BitmapCacheOption::OnLoad); jpegStreamIn->Close(); } bitmapFrame = decoder->Frames[0]; metadata = (System::Windows::Media::Imaging::BitmapMetadata^)bitmapFrame->Metadata;

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• Smooth Error in qplot from ggplot2

  - by Jared

  I have some data that I am trying to plot faceted by its Type with a smooth (Loess, LM, whatever) superimposed. Generation code is below: testFrame <- data.frame(Time=sample(20:60,50,replace=T),Dollars=round(runif(50,0,6)),Type=sample(c("First","Second","Third","Fourth"),50,replace=T,prob=c(.33,.01,.33,.33))) I have no problem either making a faceted plot, or plotting the smooth, but I cannnot do both. The first three lines of code below work fine. The fourth line is where I have trouble: qplot(Time,Dollars,data=testFrame,colour=Type) qplot(Time,Dollars,data=testFrame,colour=Type) + geom_smooth() qplot(Time,Dollars,data=testFrame) + facet_wrap(~Type) qplot(Time,Dollars,data=testFrame) + facet_wrap(~Type) + geom_smooth() It gives the following error: Error in [<-.data.frame(*tmp*, var, value = list(NA = NULL)) : missing values are not allowed in subscripted assignments of data frames What am I missing to overlay a smooth in a faceted plot? I could have sworn I had done this before, possibly even with the same data.

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• How can I write javascript that will load and print a web page to an image file and put that file in a specified location

  - by Rben

  Here's what I want to do: Load a web page from a specific location Print that web page into a jpeg, png, or other graphic file format Upload that image to another site, or save it to a location on my local network I know about window.print(), but that always seems to open up a print window, and I'd like to do as much of this operation silently as possible. Essentially, I want to be able to take a snap shot of the web page so it can be put in a directory that is accessed by one of those electronic picture frames. They can either access a web-based service, or a directory on the local network. Thanks in advance for your help, Rben

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• playing only part of a sound using FMOD

  - by carneades

  I'm trying to play only part of a sound using FMOD, say frames 50000-100000 of a 200000 frame file. I have found a couple of ways to seek forward (i.e. to start playback at frame 50000) but I have not found a way to make sure the sound stops playing at 100000. Is there any way FMOD can natively do this without having to add lbsndfile or the like into the picture? I should also mention that I am using the streaming option. I have to assume that these sounds are arbitrarily large and cannot be comfortably/quickly loaded into memory.

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• Opencv python and webcam

  - by Neil Benn

  Hello, I'm working with OpenCV on a beagleboard with ubuntu and OpenCV 1.1 interfaced via Python. I'm trying to set something up to capture a feed from a UVC compatible webcam (logitech C250). I have tested the webcam with luvcview and it works but only if I set the input format to YUV. If I run it in 'normal' mode I am getting back jpeg frames and something - somewhere is not happy! I'm trying to connect with the webcam in OpenCV as I want to get the image back from the webcam and run some analysis on it. As I have a limited device this seems to be the most efficient way of doing it - however I need to instruct the capturing system to capture in YUV and not jpeg. Is there a way of doing this (for example luvcview allow me to enter luvcview -f YUVY)? Cheers, Neil

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• dismissModalViewControllerAnimated: crashes in Simulator but not on phone

  - by Jon

  I'm doing the following: [self.parentViewController dismissModalViewControllerAnimated:YES] This code fails using the Simulator but works with no issues on the phone itself. The Simulator's console shows no erros. I used NSLog statements to pinpoint this line of code as the culprit. When running on the phone, however, the console(windoworganizer) shows that the above code is executed and the application proceeds forward with no problem. When running the code in debugger, the following statement appears at the bottom of the Xcode debug window: GDB: Data Formatters temporarily unavailable, will re-try after a 'continue'. (Not safe to call dlopen at this time.) Then a window dispalys stating: Loading 43672 stack frames. (that sounds bad) In the debug window the following line appears numerous times: [UIView(Hierarchy) _makeSubtreePerformSelector:withObject:withObject:copySublayers:] Without getting too deep into my code, does anyone know about or have experience with this type of condition? Thanks

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• Rendering videos online using flash as3 and AIR, how does it work?

  - by David

  I came accross this link that talks about the technology used with Animoto.com And it seems like they use AIR to export their flash animations to bitmaps that ffmpeg compil as a movie. http://labs.animoto.com/2009/06/07/presenting-filmstrip/ "It also takes time to render, so what you’re seeing isn’t realtime. It’s a series of Flash-generated frames that have been saved out using AIR and processed into an MP4 after the fact using a utility called FFmpeg." Does that mean AIR is installed on the server? How would that work to export a dynamicaly created aninmation into a series of pics that ffmpeg can then easily convert into a movie? David

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• WPF : how can i use a picture while i'm showing it?

  - by Roy Gavrielov

  hello, i'm trying to do so but the program throws this exception : An unhandled exception of type 'System.IO.IOException' occurred in mscorlib.dll Additional information: The process cannot access the file 'C:\Users\Roy\documents\visual studio 2010\Projects\Assignment3\Assignment3\bin\Debug\Images\Chrysanthemum.jpg' because it is being used by another process. is there a way to use it while it's open? code : if (imgAddMessage.Source != null) { BitmapImage src = (BitmapImage)imgAddMessage.Source; if (!Directory.Exists("Images")) { Directory.CreateDirectory("Images"); } FileStream stream = new FileStream("Images/" + imageName, FileMode.Create, FileAccess.ReadWrite); JpegBitmapEncoder encoder = new JpegBitmapEncoder(); encoder.Frames.Add(BitmapFrame.Create(src)); encoder.Save(stream); stream.Close(); } thanks.

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• Programmatically generate video or animated GIF in Python?

  - by FogleBird

  I have a series of images that I want to create a video from. Ideally I could specify a frame duration for each frame but a fixed frame rate would be fine too. I'm doing this in wxPython, so I can render to a wxDC or I can save the images to files, like PNG. Is there a Python library that will allow me to create either a video (AVI, MPG, etc) or an animated GIF from these frames? Edit: I've already tried PIL and it doesn't seem to work. Can someone correct me with this conclusion or suggest another toolkit? This link seems to backup my conclusion regarding PIL: http://www.somethinkodd.com/oddthinking/2005/12/06/python-imaging-library-pil-and-animated-gifs/

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• Update frequency for dynamic favicons

  - by rosscowar

  I wanted to learn how to dynamically update the favicon using the Google Chrome browser and I've noticed that the browser seems to throttle how often you can update the favicon per second and that sort of makes things look sloppy. The test page I've made for this is: http://staticadmin.com/countdown.html Which is simply a scrolling message displaying the results of a countdown. I added an input field to tweak how many pixels per second are moved by the script and I've eyeballed the max to be about 5 frames per second smoothly in Google Chrome and I have not tested it in any other browsers. My question is what is the maximum frequency, are there any ways to change, is there a particular reason behind it? NOTE: I've also noticed that this value changes based on window focus as well. It seems to drop to about 1 update per second when the browser's window isn't in focus and returns to "max" when you return.

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