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• Using FFMPEG to reliably convert videos to mp4 for iphone/ipod and flash players

  - by Jake Stevenson

  I need to convert videos for use in both a flash player and the iphone/ipod touch. I'm using the following batch script with ffmpeg: @echo off ffmpeg.exe -i %1 -s qvga -acodec libfaac -ar 22050 -ab 128k -vcodec libx264 -threads 0 -f ipod %2 This always outputs an mp4 file, and I can always play it on my PC. The videos also seem to play fine on my iphone 3GS. But with some input files it won't work for older iphone versions (3G and iPod touch). Here's the ffmpeg output from one such file: D:\ffmpeg>encode.bat d:\temp\recording.flv d:\temp\out.m4v FFmpeg version SVN-r18709, Copyright (c) 2000-2009 Fabrice Bellard, et al. configuration: --enable-memalign-hack --prefix=/mingw --cross-prefix=i686-ming w32- --cc=ccache-i686-mingw32-gcc --target-os=mingw32 --arch=i686 --cpu=i686 --e nable-avisynth --enable-gpl --enable-zlib --enable-bzlib --enable-libgsm --enabl e-libfaac --enable-libfaad --enable-pthreads --enable-libvorbis --enable-libtheo ra --enable-libspeex --enable-libmp3lame --enable-libopenjpeg --enable-libxvid - -enable-libschroedinger --enable-libx264 libavutil 50. 3. 0 / 50. 3. 0 libavcodec 52.27. 0 / 52.27. 0 libavformat 52.32. 0 / 52.32. 0 libavdevice 52. 2. 0 / 52. 2. 0 libswscale 0. 7. 1 / 0. 7. 1 built on Apr 28 2009 04:04:42, gcc: 4.2.4 [flv @ 0x187d650]skipping flv packet: type 18, size 164, flags 0 Input #0, flv, from 'd:\temp\recording.flv': Duration: 00:00:07.17, start: 0.001000, bitrate: N/A Stream #0.0: Video: flv, yuv420p, 320x240, 1k tbr, 1k tbn, 1k tbc Stream #0.1: Audio: nellymoser, 44100 Hz, mono, s16 [libx264 @ 0x13518b0]using cpu capabilities: MMX2 SSE2Fast SSSE3 FastShuffle SSE 4.2 [libx264 @ 0x13518b0]profile Baseline, level 4.2 Output #0, ipod, to 'd:\temp\out.m4v': Stream #0.0: Video: libx264, yuv420p, 320x240, q=2-31, 200 kb/s, 1k tbn, 1k tbc Stream #0.1: Audio: libfaac, 22050 Hz, mono, s16, 128 kb/s Stream mapping: Stream #0.0 -> #0.0 Stream #0.1 -> #0.1 Press [q] to stop encoding frame= 90 fps= 0 q=-1.0 Lsize= 128kB time=6.87 bitrate= 152.4kbits/s video:92kB audio:32kB global headers:1kB muxing overhead 2.620892% [libx264 @ 0x13518b0]slice I:8 Avg QP:29.62 size: 7047 [libx264 @ 0x13518b0]slice P:82 Avg QP:30.83 size: 467 [libx264 @ 0x13518b0]mb I I16..4: 17.9% 0.0% 82.1% [libx264 @ 0x13518b0]mb P I16..4: 0.6% 0.0% 0.0% P16..4: 23.1% 0.0% 0.0% 0.0% 0.0% skip:76.3% [libx264 @ 0x13518b0]final ratefactor: 57.50 [libx264 @ 0x13518b0]SSIM Mean Y:0.9544735 [libx264 @ 0x13518b0]kb/s:8412.6 My suspicion is that it has something to do with the audio encoding. If so, does anyone know how to force it to reencode the audio to the proper format? Any other ideas?

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• how many fps can iPhone's UIGetScreenImage() actually do?

  - by M Katz

  Now that Apple is officially allowing UIGetScreenImage() to be used in iPhone apps, I've seen a number of blogs saying that this "opens the floodgates" for video capture on iPhones, including older models. But I've also seen blogs that say the fastest frame rate they can get with UIGetScreenImage() is like 6 FPS. Can anyone share specific frame-rate results you've gotten with UIGetScreenImage() (or other approved APIs)? Does restricting the area of the screen captured improve frame rate significantly? Also, for the wishful thinking segment of today's program, does anyone have pointers to code/library that uses UIGetScreenImage() to capture video? For instance, I'd like an API something like Capture( int fps, Rect bounds, int durationMs ) that would turn on the camera and for the given duration record a sequence of .png files at the given frame rate, copying from the given screen rect.

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• Any screen capture software that captures webcam, microphone inputs too ?

  - by mohanr

  I am going to conduct a user study. Apart from capturing the screen while the user is interacting with the system, I also want to capture the video/audio of the user. Is there any software that in addition to capturing the screen also overlays it with the webcam/microphone inputs. The goal is to capture the complete experience of the user: key/mouse interactions with the system along with their facial/vocal responses. I know that I can maybe run a screen-capture software and also run a software for capturing webcam audio/video alongside and try to sync/overlay both these streams with timestamps. But I am going to be dealing with probably several hundred hours of data. So I am looking for a tool that can streamline the process for me amap and help me keep my sanity at end of the process. Thanks,

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• Animation or Video instead of Default.png (Iphone app)

  - by ludo

  hi, I saw in many application like Zara, Zara Home, D&G.. that instead of using the Default.png image for loading the application, they use a video instead. Did someone know how to do it? Did they manage to replace the Default image and put an animation instead or just load an animation in the ApplicationDidFinishLaunching Thanks,

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• Video Game Bots?

  - by cam

  Something I've always wondered, especially since it inspired me to start programming when I was a kid, was how video game bots work? I'm sure there are a lot of different methods, but what about automation for MMORPGs? Or even FPS-type bots?

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• How to automatically insert code for an XCode video demo

  - by Mike Weller

  I've been watching some of the WWDC 2009 videos which include some video demos in XCode. The presenters are using some sort of macro or script bound to a keyboard shortcut to automatically insert some pre-prepared code at the current caret location. Each time they press the key, the next prepared snippet is inserted. Does anybody know how this is done?

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• What video format does HTML5 use and why is it compatible with Safari on the iPad

  - by Nissan Fan

  What video format does HTML5 support that is compatible with the iPhone/iPad? I was thinking of putting together a website with some instructional videos and I'm now confused as I thought that only Quicktime was supported by Apple mobile devices.

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• Playing flash (.flv) videos on the web in a way that portable devices can view them

  - by Evan

  A friend of mine has created a movie for my site, it's in .flv format. I've heard of the popular flash player called flowplayer, but I have a bad feeling such a player will not work on the ipad and other devices which do not support flash. Is there a way to play a video in the flash format through a non-flash player so that the content can be viewed on all devices? I'm open to any ideas. Perhaps I may even need to convert the video to another format somehow. Thanks for any help, Evan

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• Get from youtube playlist video, with jQuery, api

  - by Alexander Corotchi

  Can somebody help me to suggest how can I get the play list from the youtube URL: this is the URL : http://www.youtube.com/CalgaryStampede1912 And I want to get the playlist or the first 2 videos from this video category with jQuery . Or there is some jQuery plugin for that ... Thank You !!!!!

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• Uploading videos in blackberry...

  - by tek3

  Hi.. Can anyone give me some idea regarding Uploading video files from blackberry device to server....

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• Qt Multimedia API and video decode

  - by nicolabrisotto

  Hi, I'm looking to Qt Multimedia API becouse I want to show the same video on 2 different widget. After hacking a little bit the boundled "videographicsitem" example it works using 2 GraphicsView. But this example use QMovie to decode gif, I want to decode avi, mp4, etc. What can I use to replace QMovie? Is the multimedia API supported on every platform?

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• im having problems accessing my core files/folders..

  - by Jessy Draves

  I'm wanting to build a video page that is similar to my product pages. But using different categories. I also put the videos on my product pages but I want to build a separate video page and link them all together.. I have almost 200 videos that i want my customers to be able to easily navigate through (like thumbnails). I also think that this will help my internal link structure. And my customers will be on my website longer.. Any suggestions??

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• What is holding up HD video conferencing on the web?

  - by Tristan

  What exactly is holding up real-time HD video conferencing on the web? Live, low-latency, video has lots of great applications beyond video chat: for instance, virtual desktops / vnc, remote control of applications, and server-side visualization. So what exactly are the technical barriers that remain? Existing video and remote desktop applications show latency problems are overrated for many applications. Bandwidth for many users now can easily stream 720p and even 1080p. Top-end video conferencing demos already do 1080p

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• QT Jambi HTML5 Video

  - by SamBeran

  Is it possible to use the HTML5 element within a QT Jambi QWebView? I have set up a basic app, but it doesn't display video elements.

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• getting sound on .asf video on Mac OS X

  - by user248237

  When I try to open the following video: http://streaming1.hss-win.rpi.edu/ondemand/cogsci/issues_in_cs/issues_in_cogsci_02_04_2009.asf I can get it but without any sound... I tried it both inside the browser (Firefox) and in QuickTime Media player but still it does not work. Any idea how to get this to work on Mac OS X? Using version 10.6. thank you.

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• Adding h.264 <video> support to XULRunner

  - by oskar

  Like Firefox, XULRunner only ships with support for ogg (and soon, webm) in the HTML5 video tag. Is there a relatively simple way to add h.264 support to it for all three major platforms? Perhaps a compilation flag, or a plugin I can add to it?

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• Using Windows media foundation

  - by Martin Beckett

  Ok so my new gig is high performance video (think Google streetview but movies) - the hard work is all embedded capture and image processing but: I was looking at the new MS video offerings to display content = Windows Media Foundation. Is anyone actually using this ? There are no books on the topic. The only documentation is a developer team blog with a single entry 9 months old. I thought we had got past having to learn an MS api by spying on the com control messages! Is it just another wrapper around the same old activeX control?

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• flv from vlc to ffmpeg live video error when no sound temporarily

  - by dvch

  Hi When we get live stream from vlc to ffmpeg , wherever there is sometimes 5-6 second no sound part of video , then ffmpeg is dead with this log flv @ 0x8b426d0]illegal ac vlc code at 4x6 [flv @ 0x8b426d0]Error at MB: 142 [flv @ 0x8b426d0]concealing 257 DC, 257 AC, 257 MV errors [mpegts @ 0x8b44e50]dts < pcr, TS is invalid Is there anyway to avoid this problem ?

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• how to insert audio inside video with ffmpeg??

  - by samantha

  Hi, I create a video with image in real time. I need to add at this audio in real time. I record audio with AVAudioSession but this create a file, i need to get a byte, what library must i use?? thanks

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• SimpleModal bug when positioning HTML5 video

  - by Damon Morda

  I recently Simple Modal Test <script src="http://ajax.googleapis.com/ajax/libs/jquery/1.4.2/jquery.min.js" type="text/javascript"></script> <script src="jquery.simplemodal-1.3.5.min.js" type="text/javascript"></script> <script type="text/javascript"> jQuery(function ($) { $('.simple-clicker').click(function (e) { $("#simple-container").modal(); }); }); </script> View preview Header Description of video

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• linux display drivers

  - by salman

  I've run into a major display problem on newly installed fedora 11, on my 6 years old pc which runs a pentium4 2.4 GHz processor, 1 gb ddr ram, intel 845 motherboard with integrated graphics card. When i open an image or play a video, my complete screen turns garbled. I simply cannot make out whats on my screen. With difficulty i have to close the image/video window and move around the folder window to clean the screen image. Is it because of my display drivers? How can i fix it? I also ran into mp3 plugins and flash issues which i was able to resovle. I'm new to linux, the sole purpose of isntalling it on my old pc was to learn linux but this display problem is frustrating me. Thanks, Salman

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• C# Microsoft.DirectX.AudioVideoPlayback.Video reference?

  - by yeeen

  What reference do I have to add to use "Microsoft.DirectX.AudioVideoPlayback.Video"? It is not recognized currently.

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• Qt phonon video player example C++ or python

  - by cppb

  Does anyone have a working example of a video player built using Qt phonon? (in C++ ) See my related question here . I am unable to build one using Python.

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• Android - Different ways of playing video

  - by Chris

  Hi All, I just came across the limitation of VideoView of not being able to play mp4 video files that are wider than 320 pixels. I was wondering how can we overcome these limitations. I am trying to make my app as forgiving as possible, so other than using VideoViews is there another way to play these mp4 videos? Chris

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• Generating Thumbnail from a Video file after it gets uploaded using Expression Encoder in C#

  - by user318197

  HI All, I have site where the user upload the Videos. I want to generate a thumbnail from the video after it gets uploaded and store it in the hard disk. I want to do this using expression encoder in C#. Can any1 pls help me out. Thank you.

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