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• Windows-Mobile Directshow: Specifying bitrate/quality of a WMV video capture

  - by Landstander

  Hi- I'm stumped on this, and I'm really hoping someone could point me in the right direction. I'm currently capturing video in Windows Mobile and encoding it using the WMV 9 DMO (CLSID_CWMV9EncMediaObject). That all works well enough, but the output video's bitrate is too high, resulting in a video file that's much too large for my needs. Ultimately, my goal is to mimic the video settings that Microsoft's Camera Capture Dialog outputs in the "messaging" quality mode (64kbps) from my C++ code. Currently, my code's outputting a WMV file with a bitrate of 352kbps. The only example I could find of specifying the capture bitrate with a WMV9 DMO was this. The idea in that code was basically to use a propertybag to write a bitrate to a property of the DMO. Update: In windows mobile, the closest codec property I can find that seems to equate to the bitrate is "g_wszWMVCVBRQuality". Microsoft's documentation of this property is extremely confusing to me: It basically seems to say that a higher number equates to a higher quality, but it gives absolutely no explanation of the specifics for each number. When I attempt to set this property to value like "1" via a propertybag for the WMV9 DMO, I run into a -2147467259 (unknown) error. To summarize: What is the basic strategy to specify the bitrate/quality of a video being captured via directshow (wmv9) on a windows mobile platform? I've heard (or wondered about) the following methods: Use the propertybag to change the encoder DMO's property that corresponds to bitrate/quality (currently failing) Create your own custom transcoder/encoder to specify it. This seems unnecessary since the WMV encoder works well enough- it's just at too high a bitrate. The VIDEOINFOHEADER has a bitrate property, but I suspect that specifying new settings here will do nothing to alter the actual encoding process since I wouldn't think file attributes would come into play until after the encoding. Any suggestions? PS: I would post specific source code, but at this point it may confuse more than it helps since I'm floundering so much on how to do this. At this point, I'm just trying to validate the general strategy. THANKS!

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• Android Gallery (view) video (also thumbnail issues)

  - by Drew

  Currently we have a Gallery view to which we need to add thumbnails for images/video. How do we get the already generated thumbnails (the ones that the native Gallery app shows) if we already have the image's/video's content:// URI? (We are using Android 1.6, Video.Thumbnails does not exist)

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• Memory Allocation Profiling in C++

  - by Amit Kumar

  I am writing an application and am surprised to see its total memory usage is already too high. I want to profile the dynamic memory usage of my application: How many objects of each kind are there in the heap, and which functions created these objects? Also, how much memory is used by each of the object? Is there a simple way to do this? I am working on both linux and windows, so tools of any of the platforms would suffice. NOTE: I am not concerned with memory leaks here.

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• HTML 5 video custom controls

  - by pygorex1

  Like many web developers I'm looking forward to streaming video that utilizes the new HTML 5 <video> tag. Browser support definitely isn't wide enough yet, so using a Flash/SWF fallback is a must. This got me thinking: in Flash it's possible to highly customize the playback controls (pause, play, stop, seek, volume, etc.) in HTML 5?. What options are there for customizing the glyphs, icons and colors of video controls? Is Javascript required? For instance the following page renders different controls depending on the browser - tested using FF3.5, Chrome and Safari: http://henriksjokvist.net/examples/html5-video/ It would be really awesome to customize and standardize controls across browsers and even match the Flash controls used by older browsers.

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• Pick video using PhotoPickerPlus?

  - by Anil Katti

  Is there a way I can pick video using photo-picker-plus instead of a photo? When I check the media type using: NSString *mediaType = [info objectForKey: UIImagePickerControllerMediaType]; I always get public.image (even when I pick a video). On a related note, is there any other SDK similar to photo-picker-plus for picking video from different sources? UIImagePickerController could be an option. But, I am looking for something that is as versatile as photo-picker-plus. Anil

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• Stack memory in Android

  - by Matt

  I'm writing an app that has a foreground service, content provider, and a Activity front end that binds to the service and gets back a List of objects using AIDL. The service does work and updates a database. If I leave the activity open for 4-8+ hours, and go to the "Running Services" section under settings on the phone (Nexus One) an unusually large amount of memory being used is shown (~42MB). I figure there is a leak. When I check the heap memory i get Heap size:~18MB, ~2MB allocated, ~16MB free. Analyzing the hprof in Eclipse MAT seems fine, which leads me to theorize that memory is leaking on the stack. Is this even possible? If it is, what can I do to stop or investigate the leak? Is the reported memory usage on the "Running Services" section of android even correct (I assume it is)? Another note: I have been unable to reproduce this issue when the UI is not up (with only the service running)

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• Web P2P video confrence solution

  - by dtroy

  I'm looking for the best possible solution which will allow me to incorporate live video/audio conference between 2 users(only 2 at this point) into a flash gaming platform. The video chat is not just an extra feature, it's the main one. I'm mainly looking at open source implementations or something I'll be able to implement myself, but will consider commercial products if they are exactly what I need. Here are a few things I've looked at, but so far, I didn't find any of them good enough: Flash player 10's P2P capabilities sound promising, but I am aware of the fact that Adobe has not release any information on the RTMFP protocol and that there is no commercial server which supports it at this point. Stream all the video/audio live through a flash server (not p2p), but from my personal experience you don't get a smooth conversation. I think TokBox uses this method Java applets are a possible solution too (to perform p2p), but I don't think it will be a nice and elegant solution to combine them in the game at this point (and requires the user to authorize them). BTW, I couldn't find any useful implementations. So, If you know of any, i'll look into them. Google Gmail Video Chat uses a custom (and proprietary) browser plug-in which does the p2p and streams the video/audio into the flash player. This is a possible solution, but I rather not implement the entire p2p protocol stack + browser plug-in at this stage and concentrate on other aspect of the game itself. I think they are using XMPP based protocol similar to Jingle and they've release a Jingle librarby but without the video confrencing implementation. EDIT: In response to Branden: I am aware of Adobe Stratus. Stratus is a beta, hosted rendezvous service that aids establishing communications between Flash Player endpoints (RTMFP server). This current release of the Stratus is prerelease and is designed for evaluation purposes only. The service is not final. There is no guarantee that the service will continue to exist in the future or any information about the future cost. That's why I don't think it can be used as a commercial solution. At least not yet. I'd appreciate your suggestions and advice. thanks!

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• Silverlight 4 seems like starving of memory

  - by Marco

  I have been playing a bit with Silverlight and try to port my Silverlight 3.0 application to Silverlight 4.0. My application loads different XAP files and upon a user request create an instance of a Xaml user control and adds it to the main container, in a sort of MEF approach in order I can have an extensible and pluggable application. The application is pretty huge and to keep acceptable the performances and the initial loading I have built up some helper classes to load in the background all pages and user controls that might be used later on. On Silverlight 3.0 everything was running smoothly without any problem so far. Switching to SL 4.0 I have noticed that when the process approaches to create the instances of the user controls the layout freezes unexpectedly for a minute and sometimes for more. Looking at the task manager the memory usage of IE jumps from 50MB to 400MB and sometimes up to 1.5 GB. If the process won't take that much the layout is rendered properly even though the memory usage is still extremely high. Otherwise everything crashes due to out of memory exception. Running the same application compiled in SL3, the memory used is about 200MB when all the usercontrols are loaded. Time spent to load the application in SL3 is about 10 seconds, while it takes up to 3 mins in SL4 There are no transparencies, no opacities set, no effects and animations in the layout. User controls are instantied on the fly and added or removed in the visual tree on purpose when the user switches from one screen to another. The resources are all cleaned properly when a usercontrol is removed from the visual tree to allow the GC to operate in the background. I may do something wrong but I could not figure out where exactly nail out the source of this problem. As far as I know there is no memory profiler in SL4 that can help me out to find where to look at. But again I could not be updated on new debugging tools available.

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• Objective-C memory leak in loading remote content

  - by Ican Zilb

  I try to load a plist file from my server. I can think of 2 ways to do that, but for both Instruments says there's huge memory leak : NSData* plistData = [NSData dataWithContentsOfURL:url]; and NSDictionary* updateDigest = [NSDictionary dictionaryWithContentsOfURL: [NSURL URLWithString:updateURL] ]; The backtrace of the memory leak leads to __CFURLCache in CFNetwork and I am wondering if something can be done to fix the leak? Any other way to load a remote plist xml, without the memory leakage ? Thanks

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• Why can .NET not have memory leaks?

  - by Dinah

  Ignoring unsafe code, .NET cannot have memory leaks. I've read this endlessly from many experts and I believe it. However, I do not understand why this is so. It is my understanding that the framework itself is written in C++ and C++ is susceptible to memory leaks. Is the underlying framework so well-written, that it absolutely does not have any possibility of internal memory leaks? Is there something within the framework's code that self-manages and even cures its own would-be memory leaks? Is the answer something else that I haven't considered?

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• imagejpeg memory exhaustion

  - by 0plus1

  I'm creating thumbnails cycling through a lot of images, when I find a large image I get: Fatal error: Allowed memory size of 33554432 bytes exhausted (tried to allocate 13056 bytes) Now I already know how to circumvent this with: ini_set('memory_limit', '-1'); What I want to know is why it exhaust the memory! Is there some debug tools that will show me exactly when memory is exhausting? And specifically that will show me if there are variables/arrays that are killing my memory? OR, are there better way to resize images other then: $thumb=imagecreatetruecolor($newwidth,$newheight); $source=imagecreatefromjpeg($imgfile); imagecopyresampled($thumb,$source,0,0,0,0,$newwidth,$newheight,$width,$height); imagejpeg($thumb,$destinationfile,85); ? Thank you very much!

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• Generating video or images of geometrical objects from data

  - by Jonathan Barbero

  Hello, I'm working in a course's project to predict the velocity and position of the solar system planets (and other objects). It will be really cool if I can visualize the predicted objects data, if it's possible generating 3D images, if in video that's amazing. Do you know any library that lets me to use this data to generate an image or video? (I don't care in which language) Data: - simulation step (time line step for a video) - positions of the objects - radius and/or colours of the objects Thanks in advance, any suggestion is welcome.

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• Objective-C Memory Management: When do I [release]?

  - by Sahat

  I am still new to this Memory Management stuff (Garbage Collector took care of everything in Java), but as far as I understand if you allocate memory for an object then you have to release that memory back to the computer as soon as you are finished with your object. myObject = [Object alloc]; and [myObject release]; Right now I just have 3 parts in my Objective-C .m file: @Interface, @Implementation and main. I released my object at the end of the program next to these guys: [pool drain]; return 0; But what if this program were to be a lot more complicated, would it be okay to release myObject at the end of the program? I guess a better question would be when do I release an object's allocated memory? How do I know where to place [myObject release];?

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• Is Pointer Variable also Assigned a Memory Address?

  - by yuespace

  In C++: On stack, a simple variable is assigned a memory address so that we can use pointer to contain this memory to point to it; then is a pointer also assigned a memory address? if yes, we can have pointer of pointers now? Thanks!

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• Not playing .mov files in WMP, not loading .mov files in Windows Live Movie Maker. What am I missing?

  - by royatl

  My friend needs to create a video and she has some source files that are .MOV format. I assume they are h.264. She can view the files with QuickTime. She has a laptop running Vista, and a just-downloaded version of Windows Live Movie Maker (which I'll call LMM for short). LMM shows an 'X' icon when she tries to add one of these files to it. My machine runs Windows 7 Pro, and a slightly earlier build of LMM and has no problems editing video with these source files. I assume she's missing a codec but what can I tell her? I've looked at the answer that mentions a QuickTime DirectShow Source Filter Plugin. It mentions only playback through WMP, not editing via LMM, but is that what she needs? I didn't have to load anything like that. That project's now done (she punted and used iMovie on a Mac). But I did gain another clue. She could play a 720p .MOV file, but these were 1920x1080 files.

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• Video Recording on iPhone

  - by gn-mithun

  I have this iPhone app, which plays streaming video from a source(Just video, no audio). Is there any mechanism by which i can capture this streaming video or record them, for later playback?

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• Solving iPhone/iPad out of memory issues

  - by Joonas Trussmann

  I have a strange issue where I'm scrolling through a paged UIScrollView which displays the pages of a PDF document (using Quartz 2D and CATiledLayer). When I page through memory allocation looks fine with it going up with a few initial pages and then keeping it steady as it obviously releases the memory kept for earlier pages. Upon hitting page x (not a certain PDF page or a certain number per se) memory usage goes from a couple of megs to 308 megs and the app crashes. So my question is: how to best try to find what's causing this? The object alloc tool in instruments shows the memory as simply going to malloc. (in huge chunks).

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• Virtual Memory and Paging

  - by Kenshin

  Hello, I am doing some exercices to understand how the virtual memory and paging works, my question is as follows : Suppose we use a paged memory with pages of 1024 bytes, the virtual address space is of 8 pages but the physical memory can only contain 4 frames of pages. Replacement policy is LRU. What is the physical address in main memory that corresponds to virtual address 4096? and how do you get to that result? Same thing as question 1 but with virtual address 1024 A page fault occurs when accessing a word in page 0, which page frame will be used to receive the virtual page 0? Page Image

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• Loading machinecode from file into memory and executing in C -- mprotect failing

  - by chartreusekitsune

  Hi I'm trying to load raw machine code into memory and run it from within a C program, right now when the program executes it breaks when trying to run mprotect on the memory to make it executable. I'm also not entirely sure that if the memory does get set right it will execute. What I currently have is the following: #include <memory.h> #include <sys/mman.h> #include <stdio.h> int main ( int argc, char **argv ) { FILE *fp; int sz = 0; char *membuf; int output = 0; fp = fopen(argv[1],"rb"); if(fp == NULL) { printf("Failed to open file, aborting!\n"); exit(1); } fseek(fp, 0L, SEEK_END); sz = ftell(fp); fseek(fp, 0L, SEEK_SET); membuf = (char *)malloc(sz*sizeof(char)); if(membuf == NULL) { printf("Failed to allocate memory, aborting!\n"); exit(1); } memset(membuf, 0x90, sz*sizeof(char)); if( mprotect(membuf, sz*sizeof(char), PROT_EXEC | PROT_READ | PROT_WRITE) == -1) { printf("mprotect failed!!! aborting!\n"); exit(1); } if((sz*sizeof(char)) != fread(membuf, sz*sizeof(char), 1, fp)) { printf("Read failed, aborting!\n"); exit(1); } __asm__ ( "call %%eax;" : "=a" (output) : "a" (membuf) ); printf("Output = %x\n", output); return 0; }

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• SimpleModal bug when positioning HTML5 video

  - by digm

  I am trying to use simple modal to display a modal window containing a video. I'm using the HTML5 "video" tag to do this. Using JQuery and SimpleModal, I can get it working in Chrome and Firefox, but for some reason Safari fails to maintain the centered positioning of the modal dialog for the video. In other words, when you scroll up and down in the windows, the modal window stays in its place, but the video scrolls up and down with the rest of the content outside the window. I've put together a 29 line piece of HTML code that you can cut and paste to test. https://pastee.org/z5sw Anyone know what I can do to fix this? I've been trying for a few hours now and no combination of JQuery, SimpleModal, or CSS changes can seem to fix this. I'd appreciate any suggestions. Thanks in advance!

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• Making a DVD video with a still image and PCM 16bit audio with ffmpeg

  - by João

  I'm trying to make a small video with a still image and a sound file playing in the background to pass it to dvdauthor and create a DVD. The command I'm using is this: ffmpeg -loop_input -i image.jpg -qscale 2 -i song.flac -aspect 4:3 -target pal-dvd -acodec pcm_s16le -shortest output.mpg However, the resulting video file doesn't have sound at all (testing it on VLC Player). I don't know if I can't combine "-acodec pcm_s16le" with "-target pal-dvd" to override the later, or if there is something else wrong with the command. If I try without the "-acodec pcm_s16le" parameter the video and audio works, I can even create a DVD ISO with it. However, the audio stays as AC3. I wanted to include with the video the lossless audio, not a compressed one. I suppose the DVD standart allows to have PCM audio in it, am I right?

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• renderInContext creating memory that is not promptly released

  - by iworkinprogress

  While debugging in instruments using 'ObjectAlloc' I'm noticing 7megs of memory being allocated for the renderInContext call, but it never is released. When I comment out the renderInContext call this doesn't happen, and future renderInContext calls does not continue to increase the memory allotment. UIGraphicsBeginImageContext(contentHolder.bounds.size); [contentHolder.layer renderInContext:UIGraphicsGetCurrentContext()]; UIImage *viewImage = UIGraphicsGetImageFromCurrentImageContext(); UIGraphicsEndImageContext(); Is there a way to force this memory to be released?

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• Memory leak with preg_replace

  - by Silvio Donnini

  I'm using the preg_replace function to replace accents in a string, I'm working with UTF-8. I have incurred in what seems to be a memory leak, but I can't isolate the root cause, my code is rather simple: preg_replace( array_keys($aToNoAccents), array_values($aToNoAccents), $sText ); where $aToNoAccents is an associative array with entries like '~[A]~u' => 'A', '~[C]~u' => 'C',. My script prints this error for the above line: Fatal error: Allowed memory size of 1073741824 bytes exhausted (tried to allocate 3039 bytes) Obviously it's not a matter of increasing the allowed memory for PHP, (a 1Gb footprint is way off the scale of my application). Also, that line is executed thousands of times without problems but, just for some cases which are difficult to reproduce, it yields the error. Is anyone aware of memory problems with preg_replace and UTF-8 strings? Am I to use special care in passing actual parameters to such function? I'm using PHP 5.2.6-3 with Suhosin-Patch thanks Silvio

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• Thread Local Memory, Using std::string's internal buffer for c-style Scratch Memory.

  - by Hassan Syed

  I am using Protocol Buffers and OpensSSL to generate, HMACs and then CBC encrypt the two fields to obfuscate the session cookies -- similar Kerberos tokens. Protocol Buffers' API communicates with std::strings and has a buffer caching mechanism; I exploit the caching mechanism, for successive calls in the the same thread, by placing it in thread local memory; additionally the OpenSSL HMAC and EVP CTX's are also placed in the same thread local memory structure ( see this question for some detail on why I use thread local memory and the massive amount of speedup it enables even with a single thread). The generation and deserialization, "my algorithms", of these cookie strings uses intermediary void *s and std::strings and since Protocol Buffers has an internal memory retention mechanism I want these characteristics for "my algorithms". So how do I implement a common scratch memory ? I don't know much about the rdbuf(streambuf - strinbuf ??) of the std::string object. I would presumeably need to grow it to the lowest common size ever encountered during the execution of "my algorithms". Thoughts ? My question I guess would be: " is the internal buffer of a string re-usable, and if so, how ?" Edit: See comments to Vlad's answer please.

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• How to detect when video is buffering?

  - by Leon

  Hi guys, my question today deals with Flash AS3 video buffering. (Streaming or Progressive) I want to be able to detect when the video is being buffered, so I can display some sort of animation letting the user know to wait just a little longer. Currently my video will start up, hold on frame 1 for 3-4 secs then play. Kinda giving the impression that the video is paused or broken :( Update Thanks to iandisme I believe I'm faced in the right direction now. NetStatusEvent from livedocs. It seems to me that the key status to be working in is "NetStream.Buffer.Empty" so I added some code in there to see if this would trigger my animation or a trace statement. No luck yet, however when the Buffer is full it will trigger my code :/ Maybe my video is always somewhere between Buffer.Empty and Buffer.Full that's why it won't trigger any code when I test case for Buffer.Empty? Current Code public function netStatusHandler(event:NetStatusEvent):void { // handles net status events switch (event.info.code) { case "NetStream.Buffer.Empty": trace("¤¤¤ Buffering!"); //<- never traces addChild(bufferLoop); //<- doesn't execute break; case "NetStream.Buffer.Full": trace("¤¤¤ FULL!"); //<- trace works here removeChild(bufferLoop); //<- so does any other code break; case "NetStream.Buffer.Flush": trace("¤¤¤ FLUSH!"); //Not sure if this is important break } }

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