bytedeco/javacv

recorder.record(frame); It's blocked here

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#1,974 opened on Jan 22, 2023

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Description

for (;;) { try { System.out.println(1); frame = grabber.grab(); System.out.println(2); if ((frame) != null) { System.out.println(3); recorder.setTimestamp(frame.timestamp); recorder.record(frame); System.out.println(4); } } catch (Exception e) { throw new RuntimeException(e); } } After I use javacv to transcode the stream for a period of time, in recorder.record (frame); There's a blockage here The last print number before blocking is 3

Contributor guide

Research direction
Examine the `recorder.record()` method implementation in the javacv source code, focusing on thread synchronization and FFmpeg's av interleaved write frame. Look for conditions that could cause indefinite blocking, such as buffer full or encoder flushing issues. Add additional logging to identify if the hang occurs within FFmpeg or the Java wrapper.
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.
Needs investigation
Prerequisites
Java
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
55