bytedeco/javacv

avformat_open_input() error -2: Could not open input "java.io.BufferedInputStream@49829e35". (Has setFormat() been called?)

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#1,573 opened on Jan 23, 2021

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Description

hello:

i'm use FFmpegFrameGrabber to get video metadata，then it return error infomation.The following is my code:

MetadataDto metadataDto = new MetadataDto();
    log.info("start get video mata");
    FFmpegFrameGrabber grabber = new FFmpegFrameGrabber(stream);
    grabber.start();
    int length = grabber.getLengthInFrames();
    int lengthInVideo = grabber.getLengthInVideoFrames();
    int i = 0;
    Frame frame = null;
    while (i < length) {
      frame = grabber.grabFrame();
      if ((i > FRAME_NUM) && (frame.image != null)) {
        break;
      }
      i++;
    }
    Java2DFrameConverter converter = new Java2DFrameConverter();
    BufferedImage bi = converter.getBufferedImage(frame);
    long duration = grabber.getLengthInTime() / (1000 * 1000);

    grabber.stop();

Contributor guide

Research direction
Check if setFormat() is called before start(). Also ensure the InputStream is not consumed elsewhere and is properly wrapped. Refer to JavaCV documentation for using InputStream with FFmpegFrameGrabber.
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.
2
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-3 hours
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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.
75