bytedeco/javacv

Frame grabber and recorder vertical orientation issue

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#766 opened on Aug 23, 2017

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

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Description

While grabbing frames on video recorded in portrait mode. It reads it in horizontal orientation. Tried it for different videos but the issue is persistent. Any reason for this issue?

I can do a work around with this issue by rotating the frame when it is read by frame grabber.

But after processing when I try to record the frame to an output mp4 file using frame recorder the frames in output video are translated/ shifted i.e. there is some black region around the actual content.

Contributor guide

Research direction
Investigate how FrameGrabber reads orientation metadata from video files and how FrameRecorder writes frames. Check if rotation information from EXIF or container metadata is being ignored or mishandled.
Tech stack
java
Domain
toolingdeveloper experience
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.
1-2 days
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
JavaFFmpegOpenCV
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
40