bytedeco/javacv

FFmpegFrameGrabber hangs on at the native method:av_read_frame

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#2,112 opened on Oct 19, 2023

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Description

it seems to happen at the moment that camera has been turned off suddenly.

the jstack command show this:

"192.168.0.100:554" #82 prio=5 os_prio=0 cpu=3774013.63ms elapsed=97735.35s tid=0x00007fc6040012f0 nid=0x36f312 runnable [0x00007fc8469fe000] java.lang.Thread.State: RUNNABLE at org.bytedeco.ffmpeg.global.avformat.av_read_frame(Native Method) at org.bytedeco.javacv.FFmpegFrameGrabber.grabFrame(FFmpegFrameGrabber.java:1421) - locked <0x00000006e3c7a840> (a org.bytedeco.javacv.FFmpegFrameGrabber) at org.bytedeco.javacv.FFmpegFrameGrabber.grab(FFmpegFrameGrabber.java:1351) at org.bytedeco.javacv.FrameGrabber.grabAtFrameRate(FrameGrabber.java:786)

Contributor guide

Research direction
Investigate the native av read frame call to understand why it hangs when the camera is turned off. Look for handling of stream interruptions, consider adding a timeout or checking for errors after the call.
Tech stack
java
Domain
backend
Issue type
Bug
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.
Mostly clear
Prerequisites
JavaFFmpeg
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
50