使用Python FFmpeg Streaming实现摄像头HLS推流失败问题

尝试使用Fantech Luminous C30摄像头捕获直播流并转换为HLS流时，运行代码出现错误，提示Fantech Luminous C30: No such file or directory。

错误日志 #

ERROR:root:ffmpeg failed to execute command: b'ffmpeg version 2022-12-11-git-c3e20f78b0-full_build-www.gyan.dev Copyright (c) 2000-2022 the FFmpeg developers\r\n  built with gcc 12.1.0 (Rev2, Built by MSYS2 project)\r\n 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-libsnappy --enable-zlib --enable-librist --enable-libsrt --enable-libssh --enable-libzmq --enable-avisynth --enable-libbluray --enable-libcaca --enable-sdl2 --enable-libaribb24 --enable-libdav1d --enable-libdavs2 --enable-libuavs3d --enable-libzvbi --enable-librav1e --enable-libsvtav1 --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs2 --enable-libxvid --enable-libaom --enable-libjxl --enable-libopenjpeg --enable-libvpx --enable-mediafoundation --enable-libass --enable-frei0r --enable-libfreetype --enable-libfribidi --enable-liblensfun --enable-libvidstab --enable-libvmaf --enable-libzimg --enable-amf --enable-cuda-llvm --enable-cuvid --enable-ffnvcodec --enable-nvdec --enable-nvenc --enable-d3d11va --enable-dxva2 --enable-libvpl --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-libilbc --enable-libgsm --enable-libopencore-amrnb --enable-libopus --enable-libspeex --enable-libvorbis --enable-ladspa --enable-libbs2b --enable-libflite --enable-libmysofa --enable-librubberband --enable-libsoxr --enable-chromaprint\r\n  libavutil      57. 43.100 / 57. 43.100\r\n  libavcodec     59. 55.100 / 59. 55.100\r\n  libavformat    59. 34.102 / 59. 34.102\r\n  libavdevice    59.  8.101 / 59.  8.101\r\n  libavfilter     8. 52.100 /  8. 52.100\r\n  libswscale      6.  8.112 /  6.  8.112\r\n  libswresample   4.  9.100 /  4.  9.100\r\n  libpostproc    56.  7.100 / 56.  7.100\r\nFantech Luminous C30: No such file or directory\r\n'
Traceback (most recent call last):
  File "c:\Users\ltadic\Desktop\hls stream\camera_stream.py", line 12, in <module>
    hls.output('C:\\Users\\ltadic\\Desktop\\camera_stream\\hls.m3u8')
  File "C:\Users\ltadic\AppData\Local\Programs\Python\Python311\Lib\site-packages\ffmpeg_streaming\_media.py", line 93, in output
    self.run(ffmpeg_bin, monitor, **options)
  File "C:\Users\ltadic\AppData\Local\Programs\Python\Python311\Lib\site-packages\ffmpeg_streaming\_media.py", line 121, in run  
    asyncio.run(self.async_run(ffmpeg_bin, monitor, **options))
  File "C:\Users\ltadic\AppData\Local\Programs\Python\Python311\Lib\asyncio\runners.py", line 190, in run
    return runner.run(main)
           ^^^^^^^^^^^^^^^^
  File "C:\Users\ltadic\AppData\Local\Programs\Python\Python311\Lib\asyncio\runners.py", line 118, in run
    return self._loop.run_until_complete(task)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\ltadic\AppData\Local\Programs\Python\Python311\Lib\asyncio\base_events.py", line 650, in run_until_complete     
    return future.result()
           ^^^^^^^^^^^^^^^
  File "C:\Users\ltadic\AppData\Local\Programs\Python\Python311\Lib\site-packages\ffmpeg_streaming\_media.py", line 112, in async_run
    self._run(ffmpeg_bin, monitor, **options)
  File "C:\Users\ltadic\AppData\Local\Programs\Python\Python311\Lib\site-packages\ffmpeg_streaming\_media.py", line 106, in _run
    self.pipe, err = process.run()
                     ^^^^^^^^^^^^^
  File "C:\Users\ltadic\AppData\Local\Programs\Python\Python311\Lib\site-packages\ffmpeg_streaming\_process.py", line 122, in run
    raise RuntimeError('ffmpeg failed to execute command: ', error)
RuntimeError: ('ffmpeg failed to execute command: ', "b'ffmpeg version 2022-12-11-git-c3e20f78b0-full_build-www.gyan.dev Copyright (c) 2000-2022 the FFmpeg developers\\r\\n  built with gcc 12.1.0 (Rev2, Built by MSYS2 project)\\r\\n  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-libsnappy --enable-zlib --enable-librist --enable-libsrt --enable-libssh --enable-libzmq --enable-avisynth --enable-libbluray --enable-libcaca --enable-sdl2 --enable-libaribb24 --enable-libdav1d --enable-libdavs2 --enable-libuavs3d --enable-libzvbi --enable-librav1e --enable-libsvtav1 --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs2 --enable-libxvid --enable-libaom --enable-libjxl --enable-libopenjpeg --enable-libvpx --enable-mediafoundation --enable-libass --enable-frei0r --enable-libfreetype --enable-libfribidi --enable-liblensfun --enable-libvidstab --enable-libvmaf --enable-libzimg --enable-amf --enable-cuda-llvm --enable-cuvid --enable-ffnvcodec --enable-nvdec --enable-nvenc --enable-d3d11va --enable-dxva2 --enable-libvpl --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-libilbc --enable-libgsm --enable-libopencore-amrnb --enable-libopus --enable-libspeex --enable-libvorbis --enable-ladspa --enable-libbs2b --enable-libflite --enable-libmysofa --enable-librubberband --enable-libsoxr --enable-chromaprint\\r\\n  libavutil      57. 43.100 / 57. 43.100\\r\\n  libavcodec     59. 55.100 / 59. 55.100\\r\\n  libavformat    59. 34.102 / 59. 34.102\\r\\n  libavdevice    59.  8.101 / 59.  8.101\\r\\n  libavfilter     8. 52.100 /  8. 52.100\\r\\n  libswscale 
     6.  8.112 /  6.  8.112\\r\\n  libswresample   4.  9.100 /  4.  9.100\\r\\n  libpostproc    56.  7.100 / 56.  7.100\\r\\nFantech Luminous C30: No such file or directory\\r\\n'")

原代码 #

import ffmpeg_streaming
from ffmpeg_streaming import Formats,Bitrate, Representation, Size 

video = ffmpeg_streaming.input('Fantech Luminous C30', capture = True)

_360p  = Representation(Size(640, 360), Bitrate(276 * 1024, 128 * 1024))
_480p  = Representation(Size(854, 480), Bitrate(750 * 1024, 192 * 1024))
_720p  = Representation(Size(1280, 720), Bitrate(2048 * 1024, 320 * 1024))

hls = video.hls(Formats.h264())
hls.representations(_360p, _480p, _720p)
hls.output('C:\\Users\\ltadic\\Desktop\\camera_stream\\hls.m3u8')

解决方案 #

1. 确认摄像头的正确设备标识 #

Windows系统下，FFmpeg通过dshow设备访问摄像头，需先确认设备准确名称：

• 打开命令提示符，执行：

  ffmpeg -list_devices true -f dshow -i dummy
  

• 在输出中找到摄像头对应的名称，通常格式为"Fantech Luminous C30"（带双引号，因名称含空格）。

2. 修改代码中的输入配置 #

原代码未指定设备格式，FFmpeg无法识别摄像头为捕获设备。修改输入部分，指定dshow格式并正确引用设备名称：

import ffmpeg_streaming
from ffmpeg_streaming import Formats,Bitrate, Representation, Size 

# 设备名称用双引号包裹，指定format为dshow
video = ffmpeg_streaming.input('video="Fantech Luminous C30"', format='dshow', capture=True)

_360p  = Representation(Size(640, 360), Bitrate(276 * 1024, 128 * 1024))
_480p  = Representation(Size(854, 480), Bitrate(750 * 1024, 192 * 1024))
_720p  = Representation(Size(1280, 720), Bitrate(2048 * 1024, 320 * 1024))

hls = video.hls(Formats.h264())
hls.representations(_360p, _480p, _720p)
hls.output('C:\\Users\\ltadic\\Desktop\\camera_stream\\hls.m3u8')

3. 先验证FFmpeg命令可行性 #

先用纯FFmpeg命令测试摄像头能否正常捕获并生成HLS流，排除代码库问题：

ffmpeg -f dshow -i video="Fantech Luminous C30" -c:v libx264 -f hls C:\Users\ltadic\Desktop\camera_stream\hls.m3u8

若该命令成功运行，说明设备和FFmpeg配置正常，再运行修改后的Python代码即可。

内容的提问来源于stack exchange，提问作者LUKA TADIĆ