javacv

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FFmpegFrameGrabber grabImage null

5

grabImage get frame will bo null? what reason

LW-Francis

avpackage and avframe

8

how to encode avframe to avpacket.and how to decode avpacket to avframe

LW-Francis

Java2DFrameConverter getBufferedImage throws NullPointerException with crop filtered frame

8

frame video filter:fps=fps=0.2**,crop=639:216:0:0** crop=639:216:0:0 will cause NullPointerExcepttion **filter.push(frame); Frame frameImg; if ((frameImg = filter.pull()) != null) { if (frameImg.image != null) { log.info("frame image width:{} height:{}", frameImg.imageWidth, frameImg.imageHeight); log.info("save image...

zouxiaodong

Cannot open local webcam on NetBeans JavaFX 8 Project

9

I use new version 1.5.5 with example code JavaFxPlayVideo.java on JavaFX 8 For grabbing local webcam I use `FrameGrabber grabber = new OpenCVFrameGrabber(1);` because `FFmpegFrameGrabber grabber = FFmpegFrameGrabber.createDefault(1);` is no...

Adi-18

CvCapture_MSMF::initStream Failed to reset streams

2

My device has multiple cameras, identified by camera IDs. `VideoCapture videoCapture = new VideoCapture(WEBCAM_DEVICE_INDEX);` Although they can be started, they start up very slow. It usually takes about 20 seconds...

MayZhou

'Packet mismatch' when receiving stream

7

Basically I set up a video conference tool. Sometimes the receiving part of the streams throws a series of errors as shown below: `[flv @ 0x7fce98b6d400] Packet mismatch -1057119111 7279...

apiatti

FFmpegFrameGrabber - How to set devicePath or deviceFile on Linux

22

Hi I am found this source which shows how to read video from cam and audio from microphone https://github.com/bytedeco/javacv/blob/master/samples/WebcamAndMicrophoneCapture.java#L120 ; Every time I run the example I get this exception...

jkody

about opencv_dnn.blobFromImages

3

`opencv_dnn.blobFromImages` method supports multiple pictures inference at the same time. Is it necessary to put at least two pictures? I found that when I put in only one picture, I...

4714407

When I starting HLS with some Video avformat_write_header error() error -22: Could not write header to 'C:\Users\xxx\Desktop\test_resource\result\_packetRecord.m3u8'

8

this is my code ``` public static void packetRecord(String inputFile, String outputFile) throws FrameGrabber.Exception, FrameRecorder.Exception { FFmpegFrameGrabber grabber = new FFmpegFrameGrabber(inputFile); grabber.start(); FFmpegFrameRecorder recorder = new FFmpegFrameRecorder(outputFile, grabber.getImageWidth(), grabber.getImageHeight(), grabber.getAudioChannels());...

flowclouds

How can I draw a rotated Rectangle?

19

Hello, Sorry for my question: How can I draw a rotated Rectangle? Thanks Alex

abuech2s