Perl video output [closed]

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What's the best way 开发者_如何学编程of making a video as an output of a Perl program?

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Video what? You can always use a simple graphics library like GD and a whole lot of ffmpeg to do what you want.

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If you can figure out how to produce a data stream that ffmpeg's yuvmpeg4pipe input module can handle, then you could send your data into a fifo to avoid hitting the disk with with intermediate data. Being that the yuvmpeg4pipe seems to just be a header-less data stream it should be fairly easy to replicate.

This link might give you some ideas: http://kylecordes.com/2007/pipe-ffmpeg

You could also try setting up either a memory mapped file or ramdisk of sorts to write into. But even a system with 16 gigs of ram is going to fill up very quickly when working with uncompressed video.

In general it is usually better to just write out the uncompressed files (probably an image sequence in your case) and then compress it after its exported. The reason being, if you are doing anything interesting in the video, it will probably take many times longer to render the uncompressed frames than to compress the video. By saving the uncompressed copy, you are free to compress to different targets, or fine tune your compression settings...

In addition, working with image sequences opens the door to parallel processing on multiple cores or even multiple computers. This is how many commercial video rendering systems achieve greater speeds.

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DOES NOT WORK!!!

UPDATE: Please ignore the below answer - upon reading through FFmpeg's source code, the URL input is not streamed - it's merely downloaded whole into a file and then regular file processing is done :(

I'm still leaving the answer up in case someone looking later find the FFMpeg's existance a useful info for Perl video processing, even though it doesn't help in this specific case.

ORIGINAL ANSWER FFmpeg does not (based on POD) seem to allow an in-RAM sources, but it does allow URL based ones. So at the very least you can hack around needing to do disk IO by streaming your raw data via Apache or some smaller web server, and using the FFmpeg's URL input to retrieve that data from http://localhost:yourport. The raw data would natually come to the web server from a Perl program running under mod_perl/FCGI