bytedeco/javacv

FrameGrabber with inputstream

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#1,395 opened on Apr 1, 2020

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Description

Now in Android 10, we cannot use file path, instead URI only. so to create a frame grabber, i have to do this:

    inputStream = context.getContentResolver().openInputStream(uri);
    frameGrabber = new FFmpegFrameGrabber(inputStream);
    frameGrabber.start();

I found two issues:

  1. sometimes the start() will stuck there.
  2. Saw some exceptions: Non-fatal Exception: org.bytedeco.javacv.FrameGrabber$Exception avformat_open_input() error -2: Could not open input "java.io.BufferedInputStream@db63d24". (Has setFormat() been called?)

Contributor guide

Research direction
Investigate the FFmpegFrameGrabber's initialization with InputStream on Android, ensure the format is set before opening, and verify that the InputStream is fully readable and not blocked. Also check any Android specific issues with content URIs and permissions.
Tech stack
javaandroid
Domain
mobile
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
JavaAndroidFFmpeg
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
45