Crash of jvm on grabbing devices from ffmpeg response

[stserakhau]

Hi All,

        <bytedeco.version>1.5.10-SNAPSHOT</bytedeco.version>
        <bytedeco.ffmpeg.version>6.1</bytedeco.ffmpeg.version>
        <bytedeco.opencv.version>4.8.1</bytedeco.opencv.version>

&

        <bytedeco.version>1.5.9</bytedeco.version>
        <bytedeco.ffmpeg.version>6.0</bytedeco.ffmpeg.version>
        <bytedeco.opencv.version>4.7.0</bytedeco.opencv.version>

sometimes I catch crash of JVM on the line

log.info("4: {}, {}, {}, {}", context, device, inputFormat, options);
            if (res == 0) {
                res = avformat_open_input(context, device, inputFormat, options); <<<<<< crash probably here

1st case of the output before crash log.txt

# A fatal error has been detected by the Java Runtime Environment:
#
#  EXCEPTION_ACCESS_VIOLATION (0xc0000005) at pc=0x0000000000000000, pid=12876, tid=4168
#
# JRE version: Java(TM) SE Runtime Environment (20.0.2+9) (build 20.0.2+9-78)
# Java VM: Java HotSpot(TM) 64-Bit Server VM (20.0.2+9-78, mixed mode, emulated-client, sharing, tiered, compressed oops, compressed class ptrs, g1 gc, windows-amd64)
# Problematic frame:
# C  0x00007ff8f1f11a5d

hs_err_pid12876.log

2nd case of the output before crash log2.txt

2023-12-08T11:45:42,570 INFO  [ForkJoinPool-1-worker-1] c.b.b.s.w.LocalMediaDeviceDiscoveryService: 4: org.bytedeco.ffmpeg.avformat.AVFormatContext[address=0x1e722c100c0,position=0,limit=0,capacity=0,deallocator=null], audio=@device_cm_{33D9A762-90C8-11D0-BD43-00A0C911CE86}\wave_{EB1F26F3-AAA6-4A20-AAB1-F0AA36AF8F4D}, org.bytedeco.ffmpeg.avformat.AVInputFormat[address=0x7ff8f2316c80,position=0,limit=0,capacity=0,deallocator=null], org.bytedeco.ffmpeg.avutil.AVDictionary[address=0x1e721fa09c0,position=0,limit=0,capacity=0,deallocator=null]
terminate called after throwing an instance of 'JavaCPP_exception'
  what():  java.lang.NullPointerException
terminate called recursively

Source code:

import com.banalytics.box.module.model.discovery.AudioDevice;
import com.banalytics.box.module.model.discovery.AudioProperties;
import com.banalytics.box.module.model.discovery.VideoDevice;
import com.banalytics.box.module.model.discovery.VideoProperties;
import lombok.extern.slf4j.Slf4j;
import org.bytedeco.ffmpeg.avcodec.AVCodec;
import org.bytedeco.ffmpeg.avcodec.AVCodecHWConfig;
import org.bytedeco.ffmpeg.avformat.AVOutputFormat;
import org.bytedeco.ffmpeg.global.avcodec;
import org.bytedeco.ffmpeg.global.avformat;
import org.bytedeco.javacpp.Pointer;

import java.util.*;
import java.util.stream.Collectors;

import static org.bytedeco.ffmpeg.global.avcodec.*;
import static org.bytedeco.ffmpeg.global.avutil.AVMEDIA_TYPE_VIDEO;

@Slf4j
public abstract class AbstractLocalMediaDeviceDiscovery {
    protected Map<String, AudioDevice> audioDevices = new HashMap<>();
    protected Map<String, VideoDevice> videoDevices = new HashMap<>();

    protected abstract void scanLocalDevices();

    public List<String> microphones() {
        scanLocalDevices();
        return audioDevices.values().stream()
                .sorted(Comparator.comparing(a -> a.name))
                .map(d -> d.alternativeName + "~" + d.name)
                .collect(Collectors.toList());
    }

    public List<String> cameras() {
        scanLocalDevices();
        return videoDevices.values().stream()
                .sorted(Comparator.comparing(a -> a.name))
                .map(d -> d.alternativeName + "~" + d.name)
                .collect(Collectors.toList());
    }

    public List<String> cameraResolutionsFps(String camera) {
        for (VideoDevice vd : videoDevices.values()) {
            if (vd.alternativeName.equals(camera)) {
                TreeSet<VideoProperties.ResolutionFpsCase> cases = vd.videoProperties.resolutionFpsCases;
                List<String> result = new ArrayList<>();
                for (VideoProperties.ResolutionFpsCase rfc : cases) {
                    String key = rfc.getWidth() + "x" + rfc.getHeight() + "/" + rfc.getMinFps() + "-" + rfc.getMaxFps();
                    String value = key;
                    if (rfc.getMinFps() != rfc.getMinRecommendedFps() || rfc.getMaxFps() != rfc.getMaxRecommendedFps()) {
                        value += " (" + rfc.getMinRecommendedFps() + "-" + rfc.getMaxRecommendedFps() + ")";
                    }
                    result.add(key + "~" + value);
                }
                return result;
            }
        }
        return Collections.emptyList();
    }

    public Set<String> audioSupportedSampleRates(String audio) {
        AudioDevice audioDevice = audioDevices.get(audio);
        if (audioDevice == null) {
            return Collections.emptySet();
        }
        Set<String> result = new LinkedHashSet<>();
        AudioProperties ap = audioDevice.audioProperties;

        for (AudioProperties.AudioCase ac : ap.audioCases) {
            result.add("" + ac.getRate());
        }

        return result;
    }

    /*todo below experiments */
    private final Map<String, String> videoEncoders = new TreeMap<>();
    private final Map<String, String> videoDecoders = new TreeMap<>();

    private void loadCodecs() {
        Pointer i = new Pointer((Pointer) null);

        AVOutputFormat format = avformat.av_guess_format("mp4", null, null);
        int counter = 0;
        AVCodec codec = null;
        AVCodec testCodec;
        while ((testCodec = av_codec_iterate(i)) != null) {
            log.info("Iterate {}", i);
            if (testCodec.type() == AVMEDIA_TYPE_VIDEO) {
                if (avformat.avformat_query_codec(format, testCodec.id(), FF_COMPLIANCE_STRICT) > 0) {
                    log.info("\tFormat {}", i);
                    AVCodecHWConfig hwConfig = avcodec.avcodec_get_hw_config(testCodec, 0);
                    log.info("\tConfig {}", i);
                    if (hwConfig == null) {
                        continue;
                    }
                    for (int j = 0; ; j++) {
                        hwConfig = avcodec.avcodec_get_hw_config(testCodec, j);
                        log.info("\t\tConfig {}-{}", i, j);
                        if (hwConfig == null) {
                            break;
                        }
                        if ((hwConfig.methods() & AV_CODEC_HW_CONFIG_METHOD_HW_DEVICE_CTX) > 0) {
                            log.info("\t\t" + testCodec.name().getString() + " supports device: " + hwConfig.device_type());
                            System.out.println();
                        }
                        //AV_HWDEVICE_TYPE_DXVA2
                    }

                    if (av_codec_is_encoder(testCodec) > 0)
                        log.info("\tis encoder {}", i);{
                        videoEncoders.put(testCodec.name().getString(), testCodec.long_name().getString());
                    }
                    if (av_codec_is_decoder(testCodec) > 0) {
                        log.info("\tis decoder {}", i);
                        videoDecoders.put(testCodec.name().getString(), testCodec.long_name().getString());
                    }
                }
            }
        }
    }

    public Set<String> accelerators() {
        return Set.of(
                "cuvid", "d3d11va", "dxva2", "libmfx", "qsv", "vaapi", "vdpau"
        );
    }

    public Map<String, String> accelerationDecoders() {
        if (videoEncoders.isEmpty()) {
            loadCodecs();
        }

        return videoDecoders;
    }
}

import com.banalytics.box.module.model.discovery.AudioDevice;
import com.banalytics.box.module.model.discovery.VideoDevice;
import com.banalytics.box.service.AbstractLocalMediaDeviceDiscovery;
import lombok.extern.slf4j.Slf4j;
import org.bytedeco.ffmpeg.avformat.AVFormatContext;
import org.bytedeco.ffmpeg.avformat.AVInputFormat;
import org.bytedeco.ffmpeg.avutil.AVDictionary;
import org.bytedeco.ffmpeg.avutil.LogCallback;
import org.bytedeco.ffmpeg.global.avformat;
import org.bytedeco.ffmpeg.global.avutil;
import org.bytedeco.javacpp.BytePointer;
import org.bytedeco.javacv.FFmpegLogCallback;
import org.springframework.beans.factory.InitializingBean;
import org.springframework.context.annotation.Profile;
import org.springframework.stereotype.Service;

import java.util.*;

import static org.bytedeco.ffmpeg.global.avdevice.avdevice_register_all;
import static org.bytedeco.ffmpeg.global.avformat.*;
import static org.bytedeco.ffmpeg.global.avutil.av_dict_set;

@Slf4j
@Profile({"windows"})
@Service
public class LocalMediaDeviceDiscoveryService extends AbstractLocalMediaDeviceDiscovery implements InitializingBean {

    @Override
    public void afterPropertiesSet() throws Exception {
        try {
            avdevice_register_all();
            avutil.av_log_set_level(avutil.AV_LOG_FATAL);
        } catch (Throwable e) {
            log.error(e.getMessage(), e);
        }
    }

    private volatile long expirationTimeout;

    public synchronized void scanLocalDevices() {
        log.info("============Scan started");
        synchronized (org.bytedeco.ffmpeg.global.avcodec.class) {
            long now = System.currentTimeMillis();
//            if (now < expirationTimeout) {
//                log.info("============Scan results from cache");
//                return;
//            }
            expirationTimeout = now + 120 * 1000;
            List<String> result = Collections.synchronizedList(new ArrayList<>());
            avutil.av_log_set_level(avutil.AV_LOG_INFO);
            avutil.setLogCallback(new LogCallback() {
                StringBuilder line = new StringBuilder();

                @Override
                public void call(int i, BytePointer bytePointer) {
                    try {
                        String message = bytePointer.getString("UTF-8");
                        if (message.isEmpty()) {
                            return;
                        }
                        line.append(message);
                        boolean newLine = message.indexOf('\n') > -1;
                        if (newLine) {
                            result.add(line.toString().trim());
                            line = new StringBuilder();
                        }
                    } catch (Throwable e) {
                        log.error(e.getMessage(), e);
                    }
                }
            });

            DeviceInfoAccumulator deviceInfoAccumulator = new DeviceInfoAccumulator();
            try {
                result.clear();
                execute("dshow", "list_devices", "dummy");
                Thread.sleep(50);
                deviceInfoAccumulator.process(result);

                Set<String> removedAudioDevices = new HashSet<>(audioDevices.keySet());
                for (Map.Entry<String, AudioDevice> entry : deviceInfoAccumulator.audioDevices.entrySet()) {
                    String key = entry.getKey();
                    removedAudioDevices.remove(key);
                    AudioDevice value = entry.getValue();
                    if (audioDevices.containsKey(key)) {
                        continue;
                    }
                    audioDevices.put(key, value);
                }
                removedAudioDevices.forEach(key -> audioDevices.remove(key));

                Set<String> removedVideoDevices = new HashSet<>(videoDevices.keySet());
                for (Map.Entry<String, VideoDevice> entry : deviceInfoAccumulator.videoDevices.entrySet()) {
                    String key = entry.getKey();
                    removedVideoDevices.remove(key);
                    VideoDevice val = entry.getValue();
                    if (videoDevices.containsKey(key)) {
                        continue;
                    }
                    videoDevices.put(key, val);
                }
                removedVideoDevices.forEach(key -> videoDevices.remove(key));

            } catch (Throwable e) {
                log.info(e.getMessage());
            }
            for (VideoDevice videoDevice : videoDevices.values()) {
                if (!videoDevice.videoProperties.resolutionFpsCases.isEmpty()) {
                    continue;
                }
                VideoDevicePropertyAccumulator vda = new VideoDevicePropertyAccumulator();
                try {
                    result.clear();
                    execute("dshow", "list_options", "video=" + videoDevice.alternativeName);
                    Thread.sleep(50);
                    log.info("Executed 2");
                    vda.process(result);
                } catch (Throwable e) {
                    log.info(e.getMessage());
                } finally {
                    videoDevice.videoProperties = vda.videoProperties;
                }
            }
            for (AudioDevice audioDevice : audioDevices.values()) {
                if (!audioDevice.audioProperties.audioCases.isEmpty()) {
                    continue;
                }
                AudioDevicePropertyAccumulator ada = new AudioDevicePropertyAccumulator();
                try {
                    result.clear();
                    execute("dshow", "list_options", "audio=" + audioDevice.alternativeName);
                    ada.process(result);
                } catch (Throwable e) {
                    log.info(e.getMessage());
                } finally {
                    audioDevice.audioProperties = ada.audioProperties;
                }
            }
            log.info("============Scan done");
            try {
                Thread.sleep(50);
                avutil.av_log_set_level(avutil.AV_LOG_FATAL);
                Thread.sleep(50);
                FFmpegLogCallback.set();
                Thread.sleep(50);
                log.info("============Revert to default logger");
            } catch (InterruptedException e) {
                log.error(e.getMessage(), e);
            }
        }
    }

    private static void execute(String format, String option, String device) {
        log.info("Execute: {}, {}, {}", format, option, device);
        AVFormatContext context = avformat_alloc_context();
        AVDictionary options = new AVDictionary(null);
        AVInputFormat inputFormat = avformat.av_find_input_format(format);
        log.info("1");
        try {
            log.info("2");
            context.iformat(inputFormat);
            log.info("3");
            Thread.sleep(50);
            int res = av_dict_set(options, option, "true", 0);//list_options or list_formats
            //4: org.bytedeco.ffmpeg.avformat.AVFormatContext[address=0x1e5a1490840,position=0,limit=0,capacity=0,deallocator=null], dummy, org.bytedeco.ffmpeg.avformat.AVInputFormat[address=0x7ff8f5de6c60,position=0,limit=0,capacity=0,deallocator=null], org.bytedeco.ffmpeg.avutil.AVDictionary[address=0x1e5154fcb40,position=0,limit=0,capacity=0,deallocator=null]
            //4: org.bytedeco.ffmpeg.avformat.AVFormatContext[address=0x1e5a1490840,position=0,limit=0,capacity=0,deallocator=null], video=@device_pnp_\\?\\usb#vid_0c45&pid_636b&mi_00#6&1d140336&0&0000#{65e8773d-8f56-11d0-a3b9-00a0c9223196}\global, org.bytedeco.ffmpeg.avformat.AVInputFormat[address=0x7ff8f5de6c60,position=0,limit=0,capacity=0,deallocator=null], org.bytedeco.ffmpeg.avutil.AVDictionary[address=0x1e4bccfedc0,position=0,limit=0,capacity=0,deallocator=null]

            //4: org.bytedeco.ffmpeg.avformat.AVFormatContext[address=0x1e5a1490840,position=0,limit=0,capacity=0,deallocator=null], audio=@device_cm_{33D9A762-90C8-11D0-BD43-00A0C911CE86}\wave_{EB1F26F3-AAA6-4A20-AAB1-F0AA36AF8F4D}, org.bytedeco.ffmpeg.avformat.AVInputFormat[address=0x7ff8f5de6c60,position=0,limit=0,capacity=0,deallocator=null], org.bytedeco.ffmpeg.avutil.AVDictionary[address=0x1e5154fd000,position=0,limit=0,capacity=0,deallocator=null]

            Thread.sleep(50);

            log.info("4: {}, {}, {}, {}", context, device, inputFormat, options);
            if (res == 0) {
//                System.out.println("=============== " + context + " / " + device + " / " + inputFormat + " / " + options);
                res = avformat_open_input(context, device, inputFormat, options);
                log.info("5");
                if (!context.isNull()) {
                    log.info("6");
                    avformat_close_input(context);
                    log.info("7");
                }
            }
        } catch (InterruptedException e) {
            log.error(e.getMessage(), e);
        } finally {
            log.info("8");
            avformat_free_context(context);
            log.info("9");
            context.close();
            log.info("10");
            options.close();
            log.info("11");
            inputFormat.close();
            log.info("Executed");
        }
    }
}

import com.banalytics.box.module.model.discovery.AudioDevice;
import com.banalytics.box.module.model.discovery.LocalDevice;
import com.banalytics.box.module.model.discovery.VideoDevice;

import java.util.HashMap;
import java.util.List;
import java.util.Map;

public class DeviceInfoAccumulator {
    public Map<String, AudioDevice> audioDevices = new HashMap<>();
    public Map<String, VideoDevice> videoDevices = new HashMap<>();

    LocalDevice currentDevice;

    public void process(List<String> lines) {
        for (String details : lines) {
            //todo windows case
            if (!details.contains("[dshow")) {
                continue;
            }

            if (details.contains("Alternative name")) {
                int camNameStart = details.indexOf("\"");
                int camNameEnd = details.lastIndexOf("\"");
                currentDevice.alternativeName = details.substring(camNameStart + 1, camNameEnd);
            } else {
                int camNameStart = details.indexOf("\"");
                int camNameEnd = details.lastIndexOf("\"");
                if (camNameStart == -1 || camNameEnd == -1) {
                    continue;
                }
                String name = details.substring(camNameStart + 1, camNameEnd);

                int typeStart = details.indexOf("(", camNameEnd + 1);
                int typeEnd = details.lastIndexOf(")");

                String type = details.substring(typeStart + 1, typeEnd);

                currentDevice = "audio".equals(type) ? new AudioDevice() : new VideoDevice();
                currentDevice.name = name;
            }

            if (currentDevice.isCompleted()) {
                if (currentDevice instanceof AudioDevice ad) {
                    audioDevices.put(currentDevice.alternativeName, ad);
                } else if (currentDevice instanceof VideoDevice vd) {
                    videoDevices.put(currentDevice.alternativeName, vd);
                }
            }
        }
    }
}

[saudet]

Please try to set the "org.bytedeco.javacpp.nopointergc" system property to "true".

[stserakhau]

I uses this java.exe -Xmx512m -Xms512m -Dorg.bytedeco.javacpp.nopointergc=true

Log in the 1st case shows that the JVM crash appears on the line
avformat_open_input(context, device, inputFormat, options);

Log in 2nd case shows the crash appears on the same line but with another output.

[stserakhau]

The code above

1. sets the logger to capture the FFmpeg output with device details
2. Executes FFmpeg commands, which prints devices & details via custom logger
3. Parses the captured log and extracts device details -> here DeviceInfoAccumulator

Entry point - method scanLocalDevices

Crash always appears inside private static void execute(String format, String option, String device)

sometimes on execute("dshow", "list_devices", "dummy");

sometimes on execute("dshow", "list_options", "video=" + videoDevice.alternativeName);

sometime on execute("dshow", "list_options", "audio=" + audioDevice.alternativeName);

but in all 3 cases on the line

res = avformat_open_input(context, device, inputFormat, options);

and most of the crashes appears on Execute: dshow, list_options, audio=@device_cm_{33D9A762-90C8-11D0-BD43-00A0C911CE86}\wave_{736173BF-B41F-48A4-9ED3-D161B6D3FF4F}

Hardware details extracted via ffmpeg comand line

>>>>>> ffmpeg -list_devices true -f dshow -i dummy
ffmpeg version 5.1.2-essentials_build-www.gyan.dev Copyright (c) 2000-2022 the FFmpeg developers
  built with gcc 12.1.0 (Rev2, Built by MSYS2 project)
  configuration: --enable-gpl --enable-version3 --enable-static --disable-w32threads --disable-autodetect --enable-fontconfig --enable-iconv --enable-gnutls --enable-libxml2 --enable-gmp --enable-lzma --enable-zlib --enable-libsrt --enable-libssh --enable-libzmq --enable-avisynth --enable-sdl2 --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxvid --enable-libaom --enable-libopenjpeg --enable-libvpx --enable-libass --enable-libfreetype --enable-libfribidi --enable-libvidstab --enable-libvmaf --enable-libzimg --enable-amf --enable-cuda-llvm --enable-cuvid --enable-ffnvcodec --enable-nvdec --enable-nvenc --enable-d3d11va --enable-dxva2 --enable-libmfx --enable-libgme --enable-libopenmpt --enable-libopencore-amrwb --enable-libmp3lame --enable-libtheora --enable-libvo-amrwbenc --enable-libgsm --enable-libopencore-amrnb --enable-libopus --enable-libspeex --enable-libvorbis --enable-librubberband
  libavutil      57. 28.100 / 57. 28.100
  libavcodec     59. 37.100 / 59. 37.100
  libavformat    59. 27.100 / 59. 27.100
  libavdevice    59.  7.100 / 59.  7.100
  libavfilter     8. 44.100 /  8. 44.100
  libswscale      6.  7.100 /  6.  7.100
  libswresample   4.  7.100 /  4.  7.100
  libpostproc    56.  6.100 / 56.  6.100
[dshow @ 0000020ab314ec40] "USB Camera" (video)
[dshow @ 0000020ab314ec40]   Alternative name "@device_pnp_\\?\usb#vid_0c45&pid_636b&mi_00#6&1d140336&0&0000#{65e8773d-8f56-11d0-a3b9-00a0c9223196}\global"
[dshow @ 0000020ab314ec40] "Microfon

 (USB Camera)" (audio)
[dshow @ 0000020ab314ec40]   Alternative name "**@device_cm_{33D9A762-90C8-11D0-BD43-00A0C911CE86}\wave_{736173BF-B41F-48A4-9ED3-D161B6D3FF4F}**"
[dshow @ 0000020ab314ec40] "Microfon (3- Plantronics .Audio 655 DSP)" (audio)
[dshow @ 0000020ab314ec40]   Alternative name "**@device_cm_{33D9A762-90C8-11D0-BD43-00A0C911CE86}\wave_{EB1F26F3-AAA6-4A20-AAB1-F0AA36AF8F4D}**"
dummy: Immediate exit requested

FFmpeg command to extract the device details

>>>>>>ffmpeg -f dshow -list_options true -i "audio=**@device_cm_{33D9A762-90C8-11D0-BD43-00A0C911CE86}\wave_{736173BF-B41F-48A4-9ED3-D161B6D3FF4F}**"
ffmpeg version 5.1.2-essentials_build-www.gyan.dev Copyright (c) 2000-2022 the FFmpeg developers
  built with gcc 12.1.0 (Rev2, Built by MSYS2 project)
  configuration: --enable-gpl --enable-version3 --enable-static --disable-w32threads --disable-autodetect --enable-fontconfig --enable-iconv --enable-gnutls --enable-libxml2 --enable-gmp --enable-lzma --enable-zlib --enable-libsrt --enable-libssh --enable-libzmq --enable-avisynth --enable-sdl2 --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxvid --enable-libaom --enable-libopenjpeg --enable-libvpx --enable-libass --enable-libfreetype --enable-libfribidi --enable-libvidstab --enable-libvmaf --enable-libzimg --enable-amf --enable-cuda-llvm --enable-cuvid --enable-ffnvcodec --enable-nvdec --enable-nvenc --enable-d3d11va --enable-dxva2 --enable-libmfx --enable-libgme --enable-libopenmpt --enable-libopencore-amrwb --enable-libmp3lame --enable-libtheora --enable-libvo-amrwbenc --enable-libgsm --enable-libopencore-amrnb --enable-libopus --enable-libspeex --enable-libvorbis --enable-librubberband
  libavutil      57. 28.100 / 57. 28.100
  libavcodec     59. 37.100 / 59. 37.100
  libavformat    59. 27.100 / 59. 27.100
  libavdevice    59.  7.100 / 59.  7.100
  libavfilter     8. 44.100 /  8. 44.100
  libswscale      6.  7.100 /  6.  7.100
  libswresample   4.  7.100 /  4.  7.100
  libpostproc    56.  6.100 / 56.  6.100
[dshow @ 000001b6bfcfecc0] DirectShow audio only device options (from audio devices)
[dshow @ 000001b6bfcfecc0]  Pin "Capture" (alternative pin name "Capture")
[dshow @ 000001b6bfcfecc0]   ch= 2, bits=16, rate= 44100
    Last message repeated 1 times
[dshow @ 000001b6bfcfecc0]   ch= 1, bits=16, rate= 44100
[dshow @ 000001b6bfcfecc0]   ch= 2, bits=16, rate= 32000
[dshow @ 000001b6bfcfecc0]   ch= 1, bits=16, rate= 32000
[dshow @ 000001b6bfcfecc0]   ch= 2, bits=16, rate= 22050
[dshow @ 000001b6bfcfecc0]   ch= 1, bits=16, rate= 22050
[dshow @ 000001b6bfcfecc0]   ch= 2, bits=16, rate= 11025
[dshow @ 000001b6bfcfecc0]   ch= 1, bits=16, rate= 11025
[dshow @ 000001b6bfcfecc0]   ch= 2, bits=16, rate=  8000
[dshow @ 000001b6bfcfecc0]   ch= 1, bits=16, rate=  8000
[dshow @ 000001b6bfcfecc0]   ch= 2, bits= 8, rate= 44100
[dshow @ 000001b6bfcfecc0]   ch= 1, bits= 8, rate= 44100
[dshow @ 000001b6bfcfecc0]   ch= 2, bits= 8, rate= 22050
[dshow @ 000001b6bfcfecc0]   ch= 1, bits= 8, rate= 22050
[dshow @ 000001b6bfcfecc0]   ch= 2, bits= 8, rate= 11025
[dshow @ 000001b6bfcfecc0]   ch= 1, bits= 8, rate= 11025
[dshow @ 000001b6bfcfecc0]   ch= 2, bits= 8, rate=  8000
[dshow @ 000001b6bfcfecc0]   ch= 1, bits= 8, rate=  8000
[dshow @ 000001b6bfcfecc0]   ch= 2, bits=16, rate= 48000
[dshow @ 000001b6bfcfecc0]   ch= 1, bits=16, rate= 48000
[dshow @ 000001b6bfcfecc0]   ch= 2, bits=16, rate= 96000
[dshow @ 000001b6bfcfecc0]   ch= 1, bits=16, rate= 96000
audio=**@device_cm_{33D9A762-90C8-11D0-BD43-00A0C911CE86}\wave_{736173BF-B41F-48A4-9ED3-D161B6D3FF4F}**: Immediate exit requested

[stserakhau]

The current crash appears with the next case:

1. I started grabbing from USB device - success
2. Executed scanLocalDevices() - produced JVM crash in org.bytedeco.ffmpeg.global.swscale.sws_getCachedContext

hs_err_pid12432.log

The code, which works with grabber is stable, work 24x7. Crash appears only when I try to capture the ffmpeg log with devices

Java frames: (J=compiled Java code, j=interpreted, Vv=VM code)
J 9837  org.bytedeco.ffmpeg.global.swscale.sws_getCachedContext(Lorg/bytedeco/ffmpeg/swscale/SwsContext;IIIIIIILorg/bytedeco/ffmpeg/swscale/SwsFilter;Lorg/bytedeco/ffmpeg/swscale/SwsFilter;Lorg/bytedeco/javacpp/DoublePointer;)Lorg/bytedeco/ffmpeg/swscale/SwsContext; (0 bytes) @ 0x0000019db9d0bcf6 [0x0000019db9d0bc20+0x00000000000000d6]
J 9831 c1 org.bytedeco.javacv.FFmpegFrameGrabber.processImage()V (520 bytes) @ 0x0000019db9d090bc [0x0000019db9d08d80+0x000000000000033c]
J 9943 c1 org.bytedeco.javacv.FFmpegFrameGrabber.grabFrame(ZZZZZ)Lorg/bytedeco/javacv/Frame; (1821 bytes) @ 0x0000019db9cda46c [0x0000019db9cd92e0+0x000000000000118c]
J 11097 c1 org.bytedeco.javacv.FrameGrabber.grabFrame()Lorg/bytedeco/javacv/Frame; (5 bytes) @ 0x0000019db91becfc [0x0000019db91beca0+0x000000000000005c]
j  com.banalytics.box.module.media.task.ffmpeg.GrabberStreamWorker.run()V+345
j  java.lang.Thread.runWith(Ljava/lang/Object;Ljava/lang/Runnable;)V+5 java.base@20.0.2
j  java.lang.Thread.run()V+19 java.base@20.0.2
v  ~StubRoutines::call_stub 0x0000019db8d8100d