Media_Dev
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How to calculate play time , fps, bps.. in mp4 containerMedia_Dev 2011. 1. 6. 14:47
I used the values to calculate play time and fps like so: double fps = (videoSampleCount * timeScale) / (double) duration; double videoTime = ((double) duration / (double) timeScale); bps = (unsigned int)(sample_size * trak_time_scale / duration * 8);
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mp4 StreamingMedia_Dev 2010. 10. 12. 14:05
http://atomicparsley.sourceforge.net/mpeg-4files.html http://wiki.multimedia.cx/index.php?title=QuickTime_container discribe QuickTime mp4 http://wiki.multimedia.cx/index.php?title=QuickTime_container stco & mdat What happens when atoms are added, modified or removed is that the tree gets changed, and then the lengths of the atoms needs to be re-determined. If the mdat atom moves relative to the..
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recived Http Streaming headersMedia_Dev 2010. 10. 7. 15:18
pSudo-Streaming with apache. 0000 00 0f fe 64 c2 66 00 0f fe 69 b2 d2 08 00 45 00 ...d.f.. .i....E. 0010 05 dc de 8a 40 00 80 06 f8 67 0a 01 05 16 0a 01 ....@... .g...... 0020 05 12 00 50 1a 07 b8 24 f7 0a 17 49 b3 bb 50 10 ...P...$ ...I..P. 0030 ff 9a 2b 63 00 00 48 54 54 50 2f 31 2e 31 20 32 ..+c..HT TP/1.1 2 0040 30 30 20 4f 4b 0d 0a 44 61 74 65 3a 20 54 68 75 00 OK..D ate: Thu 0050 2c 20 30 ..
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mp4 to F4v + progressDownLoadMedia_Dev 2010. 9. 10. 17:05
http://www.flashmorgan.com/index.php/2008/01/23/why-is-my-progressive-h264-video-not-playing-until-the-entire-file-is-downloaded/ What is XMP ? 1. XMP is based on XML hence grammar can be extended at anytime 2. XMP is used across all Adobe Product for a better workflow 3. XMP can help users to work and collaborate on the same project thanks to the merging capability of XMP Data. 4. Using XMP pro..
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Apple iPhone Tech Talk London 2009: Preparing and Delivering Video for iPhoneMedia_Dev 2010. 9. 7. 12:02
Thursday, 12 November 2009http://adamcohenrose.blogspot.com/2009/11/apple-iphone-tech-talk-london-2009_9454.html Eryk Vershen evershen@apple.com — Software Evangelist This presentation went really fast with loads of detail. I captured some of the highlights below, but you’ll want to get hold of the slides to get the full detail. Supposedly Apple will be putting them up later this month… challeng..
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QueryAccept (DownstreamMedia_Dev 2010. 8. 16. 18:36
http://msdn.microsoft.com/en-us/library/dd377488(v=VS.85).aspx This mechanism enables an output pin to propose a new format to its downstream peer. The new format must not require a larger buffer size. The output pin does the following: Calls IPin::QueryAccept or IPinConnection::DynamicQueryAccept on the downstream pin, to verify whether the other pin can accept the new media type (see illustrat..