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Autres articles (38)
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Encodage et transformation en formats lisibles sur Internet
10 avril 2011MediaSPIP transforme et ré-encode les documents mis en ligne afin de les rendre lisibles sur Internet et automatiquement utilisables sans intervention du créateur de contenu.
Les vidéos sont automatiquement encodées dans les formats supportés par HTML5 : MP4, Ogv et WebM. La version "MP4" est également utilisée pour le lecteur flash de secours nécessaire aux anciens navigateurs.
Les documents audios sont également ré-encodés dans les deux formats utilisables par HTML5 :MP3 et Ogg. La version "MP3" (...) -
Encoding and processing into web-friendly formats
13 avril 2011, parMediaSPIP automatically converts uploaded files to internet-compatible formats.
Video files are encoded in MP4, Ogv and WebM (supported by HTML5) and MP4 (supported by Flash).
Audio files are encoded in MP3 and Ogg (supported by HTML5) and MP3 (supported by Flash).
Where possible, text is analyzed in order to retrieve the data needed for search engine detection, and then exported as a series of image files.
All uploaded files are stored online in their original format, so you can (...) -
Supporting all media types
13 avril 2011, parUnlike most software and media-sharing platforms, MediaSPIP aims to manage as many different media types as possible. The following are just a few examples from an ever-expanding list of supported formats : images : png, gif, jpg, bmp and more audio : MP3, Ogg, Wav and more video : AVI, MP4, OGV, mpg, mov, wmv and more text, code and other data : OpenOffice, Microsoft Office (Word, PowerPoint, Excel), web (html, CSS), LaTeX, Google Earth and (...)
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Tailing last frame of a growing video file
9 janvier 2012, par ebayindirOn windows, I have a dynamically created uncompressed avi video file which grows overtime. The application which generates the video file can only write to a physical file. I can start/stop generation of video file and delete the old video file easily.
I would like to analyze the changing last frame of the growing video file to make some decision depending on the content of the current/latest image in real time. If I can achieve more than 10fps it should be enough.
I would like to get uncompressed images whenever a new frame available in the video file.As a file format I think png could be the best options in that case but I am open to alternatives.
I wonder if such a thing is possible with ffmpeg or with a similar tool.I prefer to analyze the image and make decisions by using a perl+Imager module.
Tha analyisis requirements are not complicated. Basically I just need to find existence of a few small images in certain locations inside the last frame.
I would also appreciate if you can suggest an efficient way to get this information in to my application from ffmpeg.
For example piping directly to my code or reading from saved png files.I know perl already has an ffmpeg interface module but as far as I understand that module can't provide the functionality I need.
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Output a video to a file
3 novembre 2011, par EagleEyeI am working on a very CPU intensive legacy application on windows which captures video frames from camera and displays it on the screen. Now I need to add a feature to it to save this video feed to an output file. And I have a raw image data as an input. I need to make this process as efficient as possible so that it doesn't affect the performance of my application.
So what are the best available API's in C++ that I can use to create an output video file. And moreover what should be the most efficient encoding format that I must use so that I get the maximum throughput. Also I may have to use some compression techniques. So what should be the best approach.
Moreover can I use GPU acceleration for this process and how ?
Uptil now I have encountered following tools that I may use :
- OpenCV
- Microsoft Media Foundation LIbrary or DirectShow
- ffmpeg
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How to map an audio clip to a video ?
19 janvier 2012, par simpaticoI have a video clip, and an audio clip extracted from it.
How can I trim the the video clip to to the portion extracted in the audio clip ?I imagine the solution will consist of :
- Automatically identify the pair of start position of the audio clip in the video clip, and the end position (e.g. <03:05,09:55>) ;
- Trim the video from the identified start to the identified end (that's easy).