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Sur d’autres sites (10225)

  • Multicast video stream from Dahua IP surveillance camera - ffmpeg etc [closed]

    23 mai, par Jaroslav Mazurak

    I have a Dahua IP surveillance camera and want to get the video via a multicast stream.

    


    In the camera settings, I enabled Multicast streaming, IP 239.240.1.2, and port 40000 (the default). The RTSP port is 554 (the default).

    


    Neither VLC 3.0.21 nor ffmpeg 7.1.1 work when I try to use multicast. Both of them work when I use a unicast. OS is Windows 11 x64. Both applications are allowed in the Windows firewall (any protocol, all networks ; same result if the firewall is disabled completely). I have Wireshark installed, and I see that when a client requests the stream via RTSP, the multicast traffic from the camera is present ; ffmpeg determines the stream but doesn't capture any video, and the output file is empty (it contains only the header and no video). When I use unicast, the correct output video file is saved.

    


    I have no idea what I'm doing wrong, and why ffmpeg (and VLC) doesn't capture anything in the multicast mode.

    


    Here are the ffmpeg logs for multicast and unicast modes.

    


    Multicast :

    


    ffmpeg -fflags nobuffer -flags low_delay -timeout 10M -stats -rtsp_transport udp_multicast -i "rtsp://user:password@10.10.10.10:554/cam/realmonitor?channel=1&subtype=0&unicast=false" -acodec copy -vcodec copy -y output.mkv

ffmpeg version 7.1.1-full_build-www.gyan.dev Copyright (c) 2000-2025 the FFmpeg developers
  built with gcc 14.2.0 (Rev1, Built by MSYS2 projffmpeg -fflags nobuffer -flags low_delay -timeout 10M -stats -i "rtsp://user:password@10.10.10.10:554/cam/realmonitor?channel=1&subtype=0" -acodec copy -vcodec copy -y output.mkv

ffmpeg version 7.1.1-full_build-www.gyan.dev Copyright (c) 2000-2025 the FFmpeg developers
  built with gcc 14.2.0 (Rev1, Built by MSYS2 project)
  configuration: --enable-gpl --enable-version3 --enable-static --disable-w32threads --disable-autodetect --enable-fontconfig --enable-iconv --enable-gnutls --enable-lcms2 --enable-libxml2 --enable-gmp --enable-bzlib --enable-lzma --enable-libsnappy --enable-zlib --enable-librist --enable-libsrt --enable-libssh --enable-libzmq --enable-avisynth --enable-libbluray --enable-libcaca --enable-libdvdnav --enable-libdvdread --enable-sdl2 --enable-libaribb24 --enable-libaribcaption --enable-libdav1d --enable-libdavs2 --enable-libopenjpeg --enable-libquirc --enable-libuavs3d --enable-libxevd --enable-libzvbi --enable-libqrencode --enable-librav1e --enable-libsvtav1 --enable-libvvenc --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs2 --enable-libxeve --enable-libxvid --enable-libaom --enable-libjxl --enable-libvpx --enable-mediafoundation --enable-libass --enable-frei0r --enable-libfreetype --enable-libfribidi --enable-libharfbuzz --enable-liblensfun --enable-libvidstab --enable-libvmaf --enable-libzimg --enable-amf --enable-cuda-llvm --enable-cuvid --enable-dxva2 --enable-d3d11va --enable-d3d12va --enable-ffnvcodec --enable-libvpl --enable-nvdec --enable-nvenc --enable-vaapi --enable-libshaderc --enable-vulkan --enable-libplacebo --enable-opencl --enable-libcdio --enable-libgme --enable-libmodplug --enable-libopenmpt --enable-libopencore-amrwb --enable-libmp3lame --enable-libshine --enable-libtheora --enable-libtwolame --enable-libvo-amrwbenc --enable-libcodec2 --enable-libilbc --enable-libgsm --enable-liblc3 --enable-libopencore-amrnb --enable-libopus --enable-libspeex --enable-libvorbis --enable-ladspa --enable-libbs2b --enable-libflite --enable-libmysofa --enable-librubberband --enable-libsoxr --enable-chromaprint
  libavutil      59. 39.100 / 59. 39.100
  libavcodec     61. 19.101 / 61. 19.101
  libavformat    61.  7.100 / 61.  7.100
  libavdevice    61.  3.100 / 61.  3.100
  libavfilter    10.  4.100 / 10.  4.100
  libswscale      8.  3.100 /  8.  3.100
  libswresample   5.  3.100 /  5.  3.100
  libpostproc    58.  3.100 / 58.  3.100
Input #0, rtsp, from 'rtsp://user:password@10.10.10.10:554/cam/realmonitor?channel=1&subtype=0':
  Metadata:
    title           : Media Server
  Duration: N/A, start: 0.000000, bitrate: N/A
  Stream #0:0: Video: hevc (Main), yuv420p(tv), 2560x1440, 25 fps, 25 tbr, 90k tbn
Stream mapping:
  Stream #0:0 -> #0:0 (copy)
Output #0, matroska, to 'output.mkv':
  Metadata:
    title           : Media Server
    encoder         : Lavf61.7.100
  Stream #0:0: Video: hevc (Main), yuv420p(tv), 2560x1440, q=2-31, 25 fps, 25 tbr, 1k tbn
Press [q] to stop, [?] for help
frame=    0 fps=0.0 q=-1.0 size=       0KiB time=00:00:01.32 bitrate=   0.0kbits/s speed= 2.6x    
frame=    0 fps=0.0 q=-1.0 size=       0KiB time=00:00:01.84 bitrate=   0.0kbits/s speed=1.81x    
frame=   10 fps=6.5 q=-1.0 size=       1KiB time=00:00:02.36 bitrate=   2.2kbits/s speed=1.53x    
frame=   23 fps= 11 q=-1.0 size=       1KiB time=00:00:02.88 bitrate=   1.8kbits/s speed= 1.4x    
frame=   36 fps= 14 q=-1.0 size=       1KiB time=00:00:03.40 bitrate=   1.5kbits/s speed=1.33x    
frame=   49 fps= 16 q=-1.0 size=       1KiB time=00:00:03.92 bitrate=   1.3kbits/s speed=1.27x    
frame=   62 fps= 17 q=-1.0 size=     256KiB time=00:00:04.44 bitrate= 472.3kbits/s speed=1.23x    
frame=   75 fps= 18 q=-1.0 size=     256KiB time=00:00:04.96 bitrate= 422.8kbits/s speed= 1.2x    
frame=   88 fps= 19 q=-1.0 size=     256KiB time=00:00:05.48 bitrate= 382.7kbits/s speed=1.18x    
frame=  100 fps= 19 q=-1.0 size=     256KiB time=00:00:05.96 bitrate= 351.9kbits/s speed=1.16x    
frame=  113 fps= 20 q=-1.0 size=     768KiB time=00:00:06.48 bitrate= 970.9kbits/s speed=1.14x    
frame=  126 fps= 20 q=-1.0 size=     768KiB time=00:00:07.00 bitrate= 898.8kbits/s speed=1.13x    
frame=  139 fps= 21 q=-1.0 size=     768KiB time=00:00:07.52 bitrate= 836.6kbits/s speed=1.12x    
frame=  152 fps= 21 q=-1.0 size=    1280KiB time=00:00:08.04 bitrate=1304.2kbits/s speed=1.11x    
frame=  165 fps= 21 q=-1.0 size=    1280KiB time=00:00:08.56 bitrate=1225.0kbits/s speed=1.11x    
frame=  178 fps= 22 q=-1.0 size=    1280KiB time=00:00:09.08 bitrate=1154.8kbits/s speed= 1.1x    
frame=  191 fps= 22 q=-1.0 size=    1280KiB time=00:00:09.60 bitrate=1092.3kbits/s speed= 1.1x    
frame=  203 fps= 22 q=-1.0 size=    1792KiB time=00:00:10.08 bitrate=1456.4kbits/s speed=1.09x    
frame=  217 fps= 22 q=-1.0 size=    1792KiB time=00:00:10.64 bitrate=1379.7kbits/s speed=1.09x    


[q] command received. Exiting.

[out#0/matroska @ 000001e0329cad80] video:2377KiB audio:0KiB subtitle:0KiB other streams:0KiB global headers:0KiB muxing overhead: 0.100389%
frame=  230 fps= 22 q=-1.0 Lsize=    2380KiB time=00:00:11.16 bitrate=1746.9kbits/s speed=1.08x    
ect)
  configuration: --enable-gpl --enable-version3 --enable-static --disable-w32threads --disable-autodetect --enable-fontconfig --enable-iconv --enable-gnutls --enable-lcms2 --enable-libxml2 --enable-gmp --enable-bzlib --enable-lzma --enable-libsnappy --enable-zlib --enable-librist --enable-libsrt --enable-libssh --enable-libzmq --enable-avisynth --enable-libbluray --enable-libcaca --enable-libdvdnav --enable-libdvdread --enable-sdl2 --enable-libaribb24 --enable-libaribcaption --enable-libdav1d --enable-libdavs2 --enable-libopenjpeg --enable-libquirc --enable-libuavs3d --enable-libxevd --enable-libzvbi --enable-libqrencode --enable-librav1e --enable-libsvtav1 --enable-libvvenc --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs2 --enable-libxeve --enable-libxvid --enable-libaom --enable-libjxl --enable-libvpx --enable-mediafoundation --enable-libass --enable-frei0r --enable-libfreetype --enable-libfribidi --enable-libharfbuzz --enable-liblensfun --enable-libvidstab --enable-libvmaf --enable-libzimg --enable-amf --enable-cuda-llvm --enable-cuvid --enable-dxva2 --enable-d3d11va --enable-d3d12va --enable-ffnvcodec --enable-libvpl --enable-nvdec --enable-nvenc --enable-vaapi --enable-libshaderc --enable-vulkan --enable-libplacebo --enable-opencl --enable-libcdio --enable-libgme --enable-libmodplug --enable-libopenmpt --enable-libopencore-amrwb --enable-libmp3lame --enable-libshine --enable-libtheora --enable-libtwolame --enable-libvo-amrwbenc --enable-libcodec2 --enable-libilbc --enable-libgsm --enable-liblc3 --enable-libopencore-amrnb --enable-libopus --enable-libspeex --enable-libvorbis --enable-ladspa --enable-libbs2b --enable-libflite --enable-libmysofa --enable-librubberband --enable-libsoxr --enable-chromaprint
  libavutil      59. 39.100 / 59. 39.100
  libavcodec     61. 19.101 / 61. 19.101
  libavformat    61.  7.100 / 61.  7.100
  libavdevice    61.  3.100 / 61.  3.100
  libavfilter    10.  4.100 / 10.  4.100
  libswscale      8.  3.100 /  8.  3.100
  libswresample   5.  3.100 /  5.  3.100
  libpostproc    58.  3.100 / 58.  3.100
Input #0, rtsp, from 'rtsp://user:password@10.10.10.10:554/cam/realmonitor?channel=1&subtype=0&unicast=false':
  Metadata:
    title           : Media Server
  Duration: N/A, bitrate: N/A
  Stream #0:0: Video: hevc (Main), yuv420p(tv), 2560x1440, 25 tbr, 90k tbn
Stream mapping:
  Stream #0:0 -> #0:0 (copy)
Output #0, matroska, to 'output.mkv':
  Metadata:
    title           : Media Server
    encoder         : Lavf61.7.100
  Stream #0:0: Video: hevc (Main), yuv420p(tv), 2560x1440, q=2-31, 25 tbr, 1k tbn
Press [q] to stop, [?] for help
frame=    0 fps=0.0 q=-1.0 size=       0KiB time=N/A bitrate=N/A speed=N/A    
frame=    0 fps=0.0 q=-1.0 size=       0KiB time=N/A bitrate=N/A speed=N/A    
frame=    0 fps=0.0 q=-1.0 size=       0KiB time=N/A bitrate=N/A speed=N/A    
frame=    0 fps=0.0 q=-1.0 size=       0KiB time=N/A bitrate=N/A speed=N/A    
frame=    0 fps=0.0 q=-1.0 size=       0KiB time=N/A bitrate=N/A speed=N/A    
frame=    0 fps=0.0 q=-1.0 size=       0KiB time=N/A bitrate=N/A speed=N/A    
frame=    0 fps=0.0 q=-1.0 size=       0KiB time=N/A bitrate=N/A speed=N/A    
frame=    0 fps=0.0 q=-1.0 size=       0KiB time=N/A bitrate=N/A speed=N/A    
frame=    0 fps=0.0 q=-1.0 size=       0KiB time=N/A bitrate=N/A speed=N/A    
frame=    0 fps=0.0 q=-1.0 size=       0KiB time=N/A bitrate=N/A speed=N/A    
frame=    0 fps=0.0 q=-1.0 size=       0KiB time=N/A bitrate=N/A speed=N/A    
frame=    0 fps=0.0 q=-1.0 size=       0KiB time=N/A bitrate=N/A speed=N/A    
frame=    0 fps=0.0 q=-1.0 size=       0KiB time=N/A bitrate=N/A speed=N/A    
frame=    0 fps=0.0 q=-1.0 size=       0KiB time=N/A bitrate=N/A speed=N/A    
frame=    0 fps=0.0 q=-1.0 size=       0KiB time=N/A bitrate=N/A speed=N/A    
frame=    0 fps=0.0 q=-1.0 size=       0KiB time=N/A bitrate=N/A speed=N/A    
frame=    0 fps=0.0 q=-1.0 size=       0KiB time=N/A bitrate=N/A speed=N/A    
frame=    0 fps=0.0 q=-1.0 size=       0KiB time=N/A bitrate=N/A speed=N/A    
frame=    0 fps=0.0 q=-1.0 size=       0KiB time=N/A bitrate=N/A speed=N/A    
frame=    0 fps=0.0 q=-1.0 size=       0KiB time=N/A bitrate=N/A speed=N/A    
frame=    0 fps=0.0 q=-1.0 size=       0KiB time=N/A bitrate=N/A speed=N/A    
[in#0/rtsp @ 0000014b1a80a580] Error during demuxing: Error number -138 occurred
[out#0/matroska @ 0000014b1a7ee700] video:0KiB audio:0KiB subtitle:0KiB other streams:0KiB global headers:0KiB muxing overhead: unknown
[out#0/matroska @ 0000014b1a7ee700] Output file is empty, nothing was encoded
frame=    0 fps=0.0 q=-1.0 Lsize=       1KiB time=N/A bitrate=N/A speed=N/A    


    


    Unicast :

    


    ffmpeg -fflags nobuffer -flags low_delay -timeout 10M -stats -i "rtsp://user:password@10.10.10.10:554/cam/realmonitor?channel=1&subtype=0" -acodec copy -vcodec copy -y output.mkv

ffmpeg version 7.1.1-full_build-www.gyan.dev Copyright (c) 2000-2025 the FFmpeg developers
  built with gcc 14.2.0 (Rev1, Built by MSYS2 project)
  configuration: --enable-gpl --enable-version3 --enable-static --disable-w32threads --disable-autodetect --enable-fontconfig --enable-iconv --enable-gnutls --enable-lcms2 --enable-libxml2 --enable-gmp --enable-bzlib --enable-lzma --enable-libsnappy --enable-zlib --enable-librist --enable-libsrt --enable-libssh --enable-libzmq --enable-avisynth --enable-libbluray --enable-libcaca --enable-libdvdnav --enable-libdvdread --enable-sdl2 --enable-libaribb24 --enable-libaribcaption --enable-libdav1d --enable-libdavs2 --enable-libopenjpeg --enable-libquirc --enable-libuavs3d --enable-libxevd --enable-libzvbi --enable-libqrencode --enable-librav1e --enable-libsvtav1 --enable-libvvenc --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs2 --enable-libxeve --enable-libxvid --enable-libaom --enable-libjxl --enable-libvpx --enable-mediafoundation --enable-libass --enable-frei0r --enable-libfreetype --enable-libfribidi --enable-libharfbuzz --enable-liblensfun --enable-libvidstab --enable-libvmaf --enable-libzimg --enable-amf --enable-cuda-llvm --enable-cuvid --enable-dxva2 --enable-d3d11va --enable-d3d12va --enable-ffnvcodec --enable-libvpl --enable-nvdec --enable-nvenc --enable-vaapi --enable-libshaderc --enable-vulkan --enable-libplacebo --enable-opencl --enable-libcdio --enable-libgme --enable-libmodplug --enable-libopenmpt --enable-libopencore-amrwb --enable-libmp3lame --enable-libshine --enable-libtheora --enable-libtwolame --enable-libvo-amrwbenc --enable-libcodec2 --enable-libilbc --enable-libgsm --enable-liblc3 --enable-libopencore-amrnb --enable-libopus --enable-libspeex --enable-libvorbis --enable-ladspa --enable-libbs2b --enable-libflite --enable-libmysofa --enable-librubberband --enable-libsoxr --enable-chromaprint
  libavutil      59. 39.100 / 59. 39.100
  libavcodec     61. 19.101 / 61. 19.101
  libavformat    61.  7.100 / 61.  7.100
  libavdevice    61.  3.100 / 61.  3.100
  libavfilter    10.  4.100 / 10.  4.100
  libswscale      8.  3.100 /  8.  3.100
  libswresample   5.  3.100 /  5.  3.100
  libpostproc    58.  3.100 / 58.  3.100
Input #0, rtsp, from 'rtsp://user:password@10.10.10.10:554/cam/realmonitor?channel=1&subtype=0':
  Metadata:
    title           : Media Server
  Duration: N/A, start: 0.000000, bitrate: N/A
  Stream #0:0: Video: hevc (Main), yuv420p(tv), 2560x1440, 25 fps, 25 tbr, 90k tbn
Stream mapping:
  Stream #0:0 -> #0:0 (copy)
Output #0, matroska, to 'output.mkv':
  Metadata:
    title           : Media Server
    encoder         : Lavf61.7.100
  Stream #0:0: Video: hevc (Main), yuv420p(tv), 2560x1440, q=2-31, 25 fps, 25 tbr, 1k tbn
Press [q] to stop, [?] for help
frame=    0 fps=0.0 q=-1.0 size=       0KiB time=00:00:01.32 bitrate=   0.0kbits/s speed= 2.6x    
frame=    0 fps=0.0 q=-1.0 size=       0KiB time=00:00:01.84 bitrate=   0.0kbits/s speed=1.81x    
frame=   10 fps=6.5 q=-1.0 size=       1KiB time=00:00:02.36 bitrate=   2.2kbits/s speed=1.53x    
frame=   23 fps= 11 q=-1.0 size=       1KiB time=00:00:02.88 bitrate=   1.8kbits/s speed= 1.4x    
frame=   36 fps= 14 q=-1.0 size=       1KiB time=00:00:03.40 bitrate=   1.5kbits/s speed=1.33x    
frame=   49 fps= 16 q=-1.0 size=       1KiB time=00:00:03.92 bitrate=   1.3kbits/s speed=1.27x    
frame=   62 fps= 17 q=-1.0 size=     256KiB time=00:00:04.44 bitrate= 472.3kbits/s speed=1.23x    
frame=   75 fps= 18 q=-1.0 size=     256KiB time=00:00:04.96 bitrate= 422.8kbits/s speed= 1.2x    
frame=   88 fps= 19 q=-1.0 size=     256KiB time=00:00:05.48 bitrate= 382.7kbits/s speed=1.18x    
frame=  100 fps= 19 q=-1.0 size=     256KiB time=00:00:05.96 bitrate= 351.9kbits/s speed=1.16x    
frame=  113 fps= 20 q=-1.0 size=     768KiB time=00:00:06.48 bitrate= 970.9kbits/s speed=1.14x    
frame=  126 fps= 20 q=-1.0 size=     768KiB time=00:00:07.00 bitrate= 898.8kbits/s speed=1.13x    
frame=  139 fps= 21 q=-1.0 size=     768KiB time=00:00:07.52 bitrate= 836.6kbits/s speed=1.12x    
frame=  152 fps= 21 q=-1.0 size=    1280KiB time=00:00:08.04 bitrate=1304.2kbits/s speed=1.11x    
frame=  165 fps= 21 q=-1.0 size=    1280KiB time=00:00:08.56 bitrate=1225.0kbits/s speed=1.11x    
frame=  178 fps= 22 q=-1.0 size=    1280KiB time=00:00:09.08 bitrate=1154.8kbits/s speed= 1.1x    
frame=  191 fps= 22 q=-1.0 size=    1280KiB time=00:00:09.60 bitrate=1092.3kbits/s speed= 1.1x    
frame=  203 fps= 22 q=-1.0 size=    1792KiB time=00:00:10.08 bitrate=1456.4kbits/s speed=1.09x    
frame=  217 fps= 22 q=-1.0 size=    1792KiB time=00:00:10.64 bitrate=1379.7kbits/s speed=1.09x    


[q] command received. Exiting.

[out#0/matroska @ 000001e0329cad80] video:2377KiB audio:0KiB subtitle:0KiB other streams:0KiB global headers:0KiB muxing overhead: 0.100389%
frame=  230 fps= 22 q=-1.0 Lsize=    2380KiB time=00:00:11.16 bitrate=1746.9kbits/s speed=1.08x    


    


  • avformat/iamfdec : Check side_substream_id before use

    22 avril, par Michael Niedermayer
    avformat/iamfdec : Check side_substream_id before use

    Fixes : poc-iamf-2025-04
    

    Found-by : 苏童 <220235212@seu.edu.cn>
    
Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
    • [DH] libavformat/iamfdec.c

  • ffmpeg pipe process ends right after writing first buffer data to input stream and does not keep running

    6 mai, par Taketo Matsunaga

    I have been trying to convert 16bit PCM (s16le) audio data to webm using ffmpeg in C#.&#xA;But the process ends right after the writing the first buffer data to standard input.&#xA;I has exited with the status 0, meaning success. But do not know why....&#xA;Could anyone tell me why ?

    &#xA;

    I apprecite it if you could support me.

    &#xA;

        public class SpeechService : ISpeechService&#xA;    {&#xA;        &#xA;        /// <summary>&#xA;        /// Defines the _audioInputStream&#xA;        /// </summary>&#xA;        private readonly MemoryStream _audioInputStream = new MemoryStream();&#xA;&#xA;        public async Task SendPcmAsWebmViaWebSocketAsync(&#xA;            MemoryStream pcmAudioStream,&#xA;            int sampleRate,&#xA;            int channels) &#xA;        {&#xA;            string inputFormat = "s16le";&#xA;&#xA;            var ffmpegProcessInfo = new ProcessStartInfo&#xA;            {&#xA;                FileName = _ffmpegPath,&#xA;                Arguments =&#xA;                    $"-f {inputFormat} -ar {sampleRate} -ac {channels} -i pipe:0 " &#x2B;&#xA;                    $"-f webm pipe:1",&#xA;                RedirectStandardInput = true,&#xA;                RedirectStandardOutput = true,&#xA;                RedirectStandardError = true,&#xA;                UseShellExecute = false,&#xA;                CreateNoWindow = true,&#xA;            };&#xA;&#xA;            _ffmpegProcess = new Process { StartInfo = ffmpegProcessInfo };&#xA;&#xA;            Console.WriteLine("Starting FFmpeg process...");&#xA;            try&#xA;            {&#xA;&#xA;                if (!await Task.Run(() => _ffmpegProcess.Start()))&#xA;                {&#xA;                    Console.Error.WriteLine("Failed to start FFmpeg process.");&#xA;                    return;&#xA;                }&#xA;                Console.WriteLine("FFmpeg process started.");&#xA;&#xA;            }&#xA;            catch (Exception ex)&#xA;            {&#xA;                Console.Error.WriteLine($"Error starting FFmpeg process: {ex.Message}");&#xA;                throw;&#xA;            }&#xA;&#xA;            var encodeAndSendTask = Task.Run(async () =>&#xA;            {&#xA;                try&#xA;                {&#xA;                    using var ffmpegOutputStream = _ffmpegProcess.StandardOutput.BaseStream;&#xA;                    byte[] buffer = new byte[8192]; // Temporary buffer to read data&#xA;                    byte[] sendBuffer = new byte[8192]; // Buffer to accumulate data for sending&#xA;                    int sendBufferIndex = 0; // Tracks the current size of sendBuffer&#xA;                    int bytesRead;&#xA;&#xA;                    Console.WriteLine("Reading WebM output from FFmpeg and sending via WebSocket...");&#xA;                    while (true)&#xA;                    {&#xA;                        if ((bytesRead = await ffmpegOutputStream.ReadAsync(buffer, 0, buffer.Length)) > 0)&#xA;                        {&#xA;                            // Copy data to sendBuffer&#xA;                            Array.Copy(buffer, 0, sendBuffer, sendBufferIndex, bytesRead);&#xA;                            sendBufferIndex &#x2B;= bytesRead;&#xA;&#xA;                            // If sendBuffer is full, send it via WebSocket&#xA;                            if (sendBufferIndex >= sendBuffer.Length)&#xA;                            {&#xA;                                var segment = new ArraySegment<byte>(sendBuffer, 0, sendBuffer.Length);&#xA;                                _ws.SendMessage(segment);&#xA;                                sendBufferIndex = 0; // Reset the index after sending&#xA;                            }&#xA;                        }&#xA;                    }&#xA;                }&#xA;                catch (OperationCanceledException)&#xA;                {&#xA;                    Console.WriteLine("Encode/Send operation cancelled.");&#xA;                }&#xA;                catch (IOException ex) when (ex.InnerException is ObjectDisposedException)&#xA;                {&#xA;                    Console.WriteLine("Stream was closed, likely due to process exit or cancellation.");&#xA;                }&#xA;                catch (Exception ex)&#xA;                {&#xA;                    Console.Error.WriteLine($"Error during encoding/sending: {ex}");&#xA;                }&#xA;            });&#xA;&#xA;            var errorReadTask = Task.Run(async () =>&#xA;            {&#xA;                Console.WriteLine("Starting to read FFmpeg stderr...");&#xA;                using var errorReader = _ffmpegProcess.StandardError;&#xA;                try&#xA;                {&#xA;                    string? line;&#xA;                    while ((line = await errorReader.ReadLineAsync()) != null) &#xA;                    {&#xA;                        Console.WriteLine($"[FFmpeg stderr] {line}");&#xA;                    }&#xA;                }&#xA;                catch (OperationCanceledException) { Console.WriteLine("FFmpeg stderr reading cancelled."); }&#xA;                catch (TimeoutException) { Console.WriteLine("FFmpeg stderr reading timed out (due to cancellation)."); }&#xA;                catch (Exception ex) { Console.Error.WriteLine($"Error reading FFmpeg stderr: {ex.Message}"); }&#xA;                Console.WriteLine("Finished reading FFmpeg stderr.");&#xA;            });&#xA;&#xA;        }&#xA;&#xA;        public async Task AppendAudioBuffer(AudioMediaBuffer audioBuffer)&#xA;        {&#xA;            try&#xA;            {&#xA;                // audio for a 1:1 call&#xA;                var bufferLength = audioBuffer.Length;&#xA;                if (bufferLength > 0)&#xA;                {&#xA;                    var buffer = new byte[bufferLength];&#xA;                    Marshal.Copy(audioBuffer.Data, buffer, 0, (int)bufferLength);&#xA;&#xA;                    _logger.Info("_ffmpegProcess.HasExited:" &#x2B; _ffmpegProcess.HasExited);&#xA;                    using var ffmpegInputStream = _ffmpegProcess.StandardInput.BaseStream;&#xA;                    await ffmpegInputStream.WriteAsync(buffer, 0, buffer.Length);&#xA;                    await ffmpegInputStream.FlushAsync(); // バッファをフラッシュ&#xA;                    _logger.Info("Wrote buffer data.");&#xA;&#xA;                }&#xA;            }&#xA;            catch (Exception e)&#xA;            {&#xA;                _logger.Error(e, "Exception happend writing to input stream");&#xA;            }&#xA;        }&#xA;&#xA;</byte>

    &#xA;

    Starting FFmpeg process...&#xA;FFmpeg process started.&#xA;Starting to read FFmpeg stderr...&#xA;Reading WebM output from FFmpeg and sending via WebSocket...&#xA;[FFmpeg stderr] ffmpeg version 7.1.1-essentials_build-www.gyan.dev Copyright (c) 2000-2025 the FFmpeg developers&#xA;[FFmpeg stderr]   built with gcc 14.2.0 (Rev1, Built by MSYS2 project)&#xA;[FFmpeg stderr]   configuration: --enable-gpl --enable-version3 --enable-static --disable-w32threads --disable-autodetect --enable-fontconfig --enable-iconv --enable-gnutls --enable-libxml2 --enable-gmp --enable-bzlib --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-mediafoundation --enable-libass --enable-libfreetype --enable-libfribidi --enable-libharfbuzz --enable-libvidstab --enable-libvmaf --enable-libzimg --enable-amf --enable-cuda-llvm --enable-cuvid --enable-dxva2 --enable-d3d11va --enable-d3d12va --enable-ffnvcodec --enable-libvpl --enable-nvdec --enable-nvenc --enable-vaapi --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&#xA;[FFmpeg stderr]   libavutil      59. 39.100 / 59. 39.100&#xA;[FFmpeg stderr]   libavcodec     61. 19.101 / 61. 19.101&#xA;[FFmpeg stderr]   libavformat    61.  7.100 / 61.  7.100&#xA;[FFmpeg stderr]   libavdevice    61.  3.100 / 61.  3.100&#xA;[FFmpeg stderr]   libavfilter    10.  4.100 / 10.  4.100&#xA;[FFmpeg stderr]   libswscale      8.  3.100 /  8.  3.100&#xA;[FFmpeg stderr]   libswresample   5.  3.100 /  5.  3.100&#xA;[FFmpeg stderr]   libpostproc    58.  3.100 / 58.  3.100&#xA;&#xA;[2025-05-06 15:44:43,598][INFO][XbLogger.cs:85] _ffmpegProcess.HasExited:False&#xA;[2025-05-06 15:44:43,613][INFO][XbLogger.cs:85] Wrote buffer data.&#xA;[2025-05-06 15:44:43,613][INFO][XbLogger.cs:85] Wrote buffer data.&#xA;[FFmpeg stderr] [aist#0:0/pcm_s16le @ 0000025ec8d36040] Guessed Channel Layout: mono&#xA;[FFmpeg stderr] Input #0, s16le, from &#x27;pipe:0&#x27;:&#xA;[FFmpeg stderr]   Duration: N/A, bitrate: 256 kb/s&#xA;[FFmpeg stderr]   Stream #0:0: Audio: pcm_s16le, 16000 Hz, mono, s16, 256 kb/s&#xA;[FFmpeg stderr] Stream mapping:&#xA;[FFmpeg stderr]   Stream #0:0 -> #0:0 (pcm_s16le (native) -> opus (libopus))&#xA;[FFmpeg stderr] [libopus @ 0000025ec8d317c0] No bit rate set. Defaulting to 64000 bps.&#xA;[FFmpeg stderr] Output #0, webm, to &#x27;pipe:1&#x27;:&#xA;[FFmpeg stderr]   Metadata:&#xA;[FFmpeg stderr]     encoder         : Lavf61.7.100&#xA;[FFmpeg stderr]   Stream #0:0: Audio: opus, 16000 Hz, mono, s16, 64 kb/s&#xA;[FFmpeg stderr]       Metadata:&#xA;[FFmpeg stderr]         encoder         : Lavc61.19.101 libopus&#xA;[FFmpeg stderr] [out#0/webm @ 0000025ec8d36200] video:0KiB audio:1KiB subtitle:0KiB other streams:0KiB global headers:0KiB muxing overhead: 67.493113%&#xA;[FFmpeg stderr] size=       1KiB time=00:00:00.04 bitrate= 243.2kbits/s speed=2.81x&#xA;Finished reading FFmpeg stderr.&#xA;[2025-05-06 15:44:44,101][INFO][XbLogger.cs:85] _ffmpegProcess.HasExited:True&#xA;[2025-05-06 15:44:44,132][ERROR][XbLogger.cs:67] Exception happend writing to input stream&#xA;System.ObjectDisposedException: Cannot access a closed file.&#xA;   at System.IO.FileStream.WriteAsync(Byte[] buffer, Int32 offset, Int32 count, CancellationToken cancellationToken)&#xA;   at System.IO.Stream.WriteAsync(Byte[] buffer, Int32 offset, Int32 count)&#xA;   at EchoBot.Media.SpeechService.AppendAudioBuffer(AudioMediaBuffer audioBuffer) in C:\Users\tm068\Documents\workspace\myprj\xbridge-teams-bot\src\EchoBot\Media\SpeechService.cs:line 242&#xA;

    &#xA;

    I am expecting the ffmpeg process keep running.

    &#xA;

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