bytedeco/javacv

FFmpegFrameGrabber doesn't autorotate frames

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#1,222 opened on Jun 5, 2019

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

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Description

I noticed that FFmpegFrameGrabber does not autorotate frames nor does it allow to enable handling rotation automatically. I checked that with the ffmpeg command line tool and it does automatically rotate videos with "rotation" metadata set (so the output video does NOT have "rotation" metadata set and is already at the right orientation).

Contributor guide

Research direction
Investigate the FFmpegFrameGrabber source code to find where rotation metadata from video files is ignored, then implement automatic rotation handling, possibly by applying a rotation transformation to frames.
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.
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.
50