[FFmpeg-user] Building a video on the fly?

Anthony Brown av at bsbc.nb.ca
Sat Feb 4 17:26:33 CET 2012

On 12-02-04 11:59 AM, John Dexter wrote:
> First post, please be gentle!
> I'm debating whether I need to use the libraries programatically or can
> manage with the command-line tool. My app does 3D rendering and the idea is
> to build a video from the rendered frames.
> Now I know I can save all frames to individual image files and then build a
> video, but I'm not sure it will be practical in our case. So I wondered if
> ffmpeg command-line tools provide any way to build a video "on the fly" -
> e.g each rendered frame gets saved to a file and ffmpeg is told to add this
> to an existing video, then the image file is deleted. Since I'm pretty sure
> video encoding requires looking forwards (and maybe backwards?) several
> frames it seems a bit of a long shot, but it seems worth checking first.

The command line tool can certainly convert a folder full of images into 
a video file, so you could at the very least build the video after all 
the frames were rendered.  For on the fly you might get away with 
converting each frame into a very short video and then concatenating it 
to the previous frames, choose a video format that makes this easy to do.


Anthony Brown
Audiovisual coordinator
Brunswick Street Baptist Church
Telephone: (506)-458-8348 (leave message)
Email:     av at bsbc.nb.ca
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