Large video file processing (~10GB)

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Jacob Bucci
Jacob Bucci el 15 de Oct. de 2012
Comentada: Image Analyst el 9 de Sept. de 2022
Hello,
I'm looking to process large video files to run an object tracking algorithm.
I've been developing using the VideoReader object to run through the images of the movie, but it gets bogged down and will never complete with large files. I read that using the vision.VideoFileReader object ( http://www.mathworks.com/matlabcentral/newsreader/view_thread/287250) is a better option for this more streaming-type application, but it seems to really struggle with the size too.
Is there an easy way to process multi-GB video files in a reasonable amount of time or should I focus on down-sampling everything into more manageable chunks?
Thanks,
Jake

Respuestas (2)

Image Analyst
Image Analyst el 15 de Oct. de 2012
Are you using imshow() to display images? If you don't use cla in between calls to it, then all the images get stored in the display buffer (the axes) and that can really slow things down a lot if you have dozens of images. Just one thing to check that might speed things up.
  1 comentario
Jacob Bucci
Jacob Bucci el 17 de Oct. de 2012
I am not, although at one point I was and removing it didn't make a noticeable improvement.. To give you an idea, these videos usually come with ~2 million frames to sample from. The slowest I can sample is 1 frame per second which equates to every 30th frame - and even then it still gets bogged down big time.

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Hb
Hb el 8 de Sept. de 2022
Editada: Hb el 8 de Sept. de 2022
Hello, I have used the sample code that you have written, Video Processing Tutorial, and I too face the similar issue when trying to read avi video files that are about 12GB. Could you please recommend a solution? Thank you!
  7 comentarios
Hb
Hb el 8 de Sept. de 2022
Just to clarify, I have no issue in reading and writing avi files that around 2GB, but it errors out when trying to read files around 14GB. Also, I'm not able to attach a video, as there is a 5MB limit.
Image Analyst
Image Analyst el 9 de Sept. de 2022
Then I think you'll need to work with tech support as we can't help you anymore.

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