bytedeco/javacv

FFmpegFrameGrabber immediately stop in docker

Open

#1,824 opened on Jun 9, 2022

View on GitHub
 (4 comments) (0 reactions) (0 assignees)Java (1,583 forks)batch import
help wantedquestion

Repository metrics

Stars
 (6,985 stars)
PR merge metrics
 (No merged PRs in 30d)

Description

Description of the problem : I'm using FFmpegFrameGrabber to pull rtsp stream and grab image. But when i run it in docker on Linux server (32core), start will block when run more than 10 threads. Then i try run java -jar on server , it works more than 60 threads. what's the reason ? In docker , i can't even see ffmpeg log. this is my code: avutil.av_log_set_level(avutil.AV_LOG_INFO); FFmpegLogCallback.set(); FFmpegFrameGrabber grabber = new FFmpegFrameGrabber(streamUrl); grabber.setOption("rtsp_transport", "tcp"); grabber.setOption("rtsp_flags", "prefer_tcp"); grabber.startUnsafe(false);

Additional notes: docker image is centos:7.9

Contributor guide

Research direction
Compare the Docker resource limits (CPU, memory, pids) with native environment. Ensure that ffmpeg log output is visible by redirecting stderr. Investigate if thread number is limited by Docker's pid cgroup or nproc ulimit. Try increasing ulimit u and checking container logs.
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.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
Half day
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
JavaGitDocker
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
60