bytedeco/javacv

Question: How to generate Stream<Frame> in java 8

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#1,708 opened on Oct 14, 2021

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enhancementhelp wanted

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Description

Hi,

I am trying to generate stream of frames after reading it in Java 8.

FFmpegFrameGrabber gb = new FFmpegFrameGrabber (videoFile);
Stream.iterate(grabber.grabImage(), x - {
try {
  return grabber.grabImage()
} catch(Exception e) {
}
return null;
});

In java 9 I can use takeWhile(frame -> frame != null) but I am not sure how to do it in Java 8. Is there any api provide in API that directly returns stream of frames?

Contributor guide

Research direction
Explore using StreamSupport.stream() with a custom Spliterator to convert the iterative grabbing into a stream. Also check if JavaCV provides a method like grabber.stream() or similar.
Tech stack
java
Domain
computer vision
Issue type
Research
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
2
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-3 hours
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
Java
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
75