bytedeco/javacv

Is there a way to synchronize grabber to the latest frame, like some features in video players.

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#1,575 opened on Jan 25, 2021

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 (10 comments) (0 reactions) (0 assignees)Java (1,583 forks)batch import
enhancementhelp wanted

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Description

When I use FFmpegFrameGrabber to extract an image from a RTSP url every 2 seconds, the actual FrameRate is sometimes lower than 25(grabber.getVideoFrameRate ()) due to network reasons。 After a period of time, I found that the time of the video in the picture will lag behind the current time, and continue to lag behind. Is there a way to synchronize grabber to the latest frame, like some features in VideoPlayers.

Contributor guide

Research direction
Look into FFmpeg's seek mechanisms for live streams, such as av seek frame with AVSEEK FLAG BACKWARD, and consider increasing the probe size or using the ' fflags nobuffer' and ' flags low delay' options. Additionally, explore the JavaCV FrameGrabber methods for discarding old frames or seeking to the latest timestamp.
Tech stack
java
Domain
backend
Issue type
Feature
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.
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
Java
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
30