bytedeco/javacv

it's been released recently opencv 5 https://github.com/opencv/opencv/wiki/OpenCV-5 Can we include support for it?

Recently, while using JavaCV to ingest a video stream, I encountered a crash when the connected live stream's resolution dynamically increased. Interestingly, the stream remains stable if the resolution decreases. The error message is: [h264_cuvid @ ...] AVHWFramesContext is already initialized with incompatible parameters After inspecting the source code, I found the following check if (hwframe_ctx->pool && ( hwframe_ctx->width < avctx->width || hwframe_ctx->height < avctx->height || hwframe_ctx->format != AV_PIX_FMT_CUDA || hwframe_ctx->sw_format != avctx->sw_pix_fmt)) { av_log(avctx, AV_LOG_ERROR, "AVHWFramesContext is already initialized with incompatible parameters\n"); // ... debug logs ... ctx->internal_error = AVERROR(EINVAL); return 0; It appears this is related to the hardware context initialization. My Question: Is it possible to manually preset a hardware context (AVHWFramesContext) with a

As stated in the title, when using FFmpegFrameGrabber, if start() is not called beforehand, methods such as getImageWidth() will return 0. This behavior may cause errors to propagate downstream and lead to issues that are more difficult to trace. I believe an IllegalStateException should be thrown immediately to clearly indicate that this operation is invalid.

I want to write SEI(User Data Unregister) to H264/HEVC videos by FFmpegFrameRecorder, and read them back by FFmpegFrameGrabber. How should I code? May side_data be another way?

javacv version 1.5.9 ffmpeg version 6.0 I have two test cases, one is to use ffmpeg directly through javacv, and the other is to process videos through grabber and recorder in Java. The code is as follows @Test public void testFfmpegWithJavaCV() throws IOException, InterruptedException { String inputPath = "D:\\video\\test.mp4"; String outputPath = "D:\\video\\output_ffmpeg_500k.mp4"; String ffmpeg = Loader.load(org.bytedeco.ffmpeg.ffmpeg.class); long startTime = System.currentTimeMillis(); ProcessBuilder pb = new ProcessBuilder(ffmpeg, "-i", inputPath, "-vcodec", "h264", "-b:v", "500k", "-bufsize", "2M", outputPath); pb.inheritIO().start().waitFor(); log.info("Compression completed in {}ms", System.currentTimeMillis() - startTime); } @Test public void testRecord() throws FrameRecorder.Exception, FrameGrabber.Exception { String inputPath = "D:\\video\\test.mp4"; String outputPath = "D:\\video\\output_javacv_500k.mp4"; try (FFmpegFrameGrabber