video - 在 Windows 上使用 ffmpeg，从 Logitech c930e 捕获硬件编码的 H264 流的命令是什么

Question

我在 Windows 8 上使用 ffmpeg，我想从罗技 c930e 相机捕获内置的 H264 硬件编码流。 H264 内置编码流是 UVC 1.5 接口(interface)的一部分。

使用这个命令我注意到 c930e 通过 DirectShow 暴露了两个视频引脚:0 和 1。
ffmpeg -report -list_options true -f dshow -i video="Logitech Webcam C930e"[dshow @ 0000000002d89360] Pin "Capture" (alternative pin name "0")[dshow @ 0000000002d89360] Pin "Capture" (alternative pin name "1")
选择 Pin 0 或 1 似乎无关紧要，我仍然可以从 Logitech c930e 网络摄像头获得原始视频。在 Linux 上，假定的命令涉及 v4l2，但在 http://ffmpeg.zeranoe.com/builds/ 的默认 Windows 版本的 ffmpeg 中似乎不存在。

ffmpeg的默认windows构建是否支持直接捕获UVC接口(interface)？

这是我在这次旅程中最接近的一次，但仍然不太正确:
ffmpeg -report -f dshow -i video="Logitech Webcam C930e" -s 1920x1080 -r 30 -video_pin_name 1 -vcodec H264 -c copy -f mp4 Logitechc930eFeed.mp4
截至 2015 年 4 月 17 日，我仍在努力解决这个问题并获得两条新信息。

我在罗技的网站上发现了这篇有趣的文章，它指导用户将默认的罗技驱动程序更改为通用 USB 视频设备驱动程序:
https://support.logitech.com/en_us/article/Install-native-UVC-drivers-for-your-Logitech-webcam?product=a0qi00000069v0MAAQ#

我还发现我的 C930e 有一个较旧的固件 (8.0.866)，罗技建议将固件更新到 8.0.875 以修复未指定的 UVC H.264 问题。

所以现在我有了最新的固件，并且在 Windows 8.1 上使用通用的“USB 视频设备”。
ffmpeg -list_devices true -f dshow -i
这给出了这个输出:
ffmpeg version N-69608-g9dc45d1 Copyright (c) 2000-2015 the FFmpeg developers
built with gcc 4.9.2 (GCC)
configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-lzma --enable-decklink --enable-zlib
libavutil 54. 18.100 / 54. 18.100
libavcodec 56. 21.102 / 56. 21.102
libavformat 56. 19.100 / 56. 19.100
libavdevice 56. 4.100 / 56. 4.100
libavfilter 5. 9.103 / 5. 9.103
libswscale 3. 1.101 / 3. 1.101
libswresample 1. 1.100 / 1. 1.100
libpostproc 53. 3.100 / 53. 3.100
[dshow @ 00000000045c9360] DirectShow video devices (some may be both video and audio devices)
[dshow @ 00000000045c9360] "Logitech Webcam C930e"
[dshow @ 00000000045c9360] Alternative name "@device_pnp_\\?\usb#vid_046d&pid_0843&mi_00#7&3693c0e6&1&0000#{65e8773d-8f56-11d0-a3b9-00a0c9223196}\global"
[dshow @ 00000000045c9360] DirectShow audio devices
[dshow @ 00000000045c9360] "Microphone (Logitech Webcam C930e)"
[dshow @ 00000000045c9360] Alternative name "@device_cm_{33D9A762-90C8-11D0-BD43-00A0C911CE86}\wave_{BB8BE70B-4DDC-465F-9247-86E6EC98D627}"
dummy: Immediate exit requested
这个命令:ffmpeg -list_options true -f dshow -i video="Logitech Webcam C930e"
仍然给出这个输出:ffmpeg version N-69608-g9dc45d1 Copyright (c) 2000-2015 the FFmpeg developers
built with gcc 4.9.2 (GCC)
configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-lzma --enable-decklink --enable-zlib
libavutil 54. 18.100 / 54. 18.100
libavcodec 56. 21.102 / 56. 21.102
libavformat 56. 19.100 / 56. 19.100
libavdevice 56. 4.100 / 56. 4.100
libavfilter 5. 9.103 / 5. 9.103
libswscale 3. 1.101 / 3. 1.101
libswresample 1. 1.100 / 1. 1.100
libpostproc 53. 3.100 / 53. 3.100
[dshow @ 0000000004469360] DirectShow video device options (from video devices)
[dshow @ 0000000004469360] Pin "Capture" (alternative pin name "0")
[dshow @ 0000000004469360] pixel_format=yuyv422 min s=640x480 fps=5 max s=640x480 fps=30
[dshow @ 0000000004469360] pixel_format=yuyv422 min s=640x480 fps=5 max s=640x480 fps=30
[dshow @ 0000000004469360] pixel_format=yuyv422 min s=160x120 fps=5 max s=160x120 fps=30
[dshow @ 0000000004469360] pixel_format=yuyv422 min s=160x120 fps=5 max s=160x120 fps=30
[dshow @ 0000000004469360] pixel_format=yuyv422 min s=176x144 fps=5 max s=176x144 fps=30
[dshow @ 0000000004469360] pixel_format=yuyv422 min s=176x144 fps=5 max s=176x144 fps=30
[dshow @ 0000000004469360] pixel_format=yuyv422 min s=320x180 fps=5 max s=320x180 fps=30
[dshow @ 0000000004469360] pixel_format=yuyv422 min s=320x180 fps=5 max s=320x180 fps=30
[dshow @ 0000000004469360] pixel_format=yuyv422 min s=320x240 fps=5 max s=320x240 fps=30
[dshow @ 0000000004469360] pixel_format=yuyv422 min s=320x240 fps=5 max s=320x240 fps=30
[dshow @ 0000000004469360] pixel_format=yuyv422 min s=352x288 fps=5 max s=352x288 fps=30
[dshow @ 0000000004469360] pixel_format=yuyv422 min s=352x288 fps=5 max s=352x288 fps=30
[dshow @ 0000000004469360] pixel_format=yuyv422 min s=424x240 fps=5 max s=424x240 fps=30
[dshow @ 0000000004469360] pixel_format=yuyv422 min s=424x240 fps=5 max s=424x240 fps=30
[dshow @ 0000000004469360] pixel_format=yuyv422 min s=480x270 fps=5 max s=480x270 fps=30
[dshow @ 0000000004469360] pixel_format=yuyv422 min s=480x270 fps=5 max s=480x270 fps=30
[dshow @ 0000000004469360] pixel_format=yuyv422 min s=640x360 fps=5 max s=640x360 fps=30
[dshow @ 0000000004469360] pixel_format=yuyv422 min s=640x360 fps=5 max s=640x360 fps=30
[dshow @ 0000000004469360] pixel_format=yuyv422 min s=800x448 fps=5 max s=800x448 fps=30
[dshow @ 0000000004469360] pixel_format=yuyv422 min s=800x448 fps=5 max s=800x448 fps=30
[dshow @ 0000000004469360] pixel_format=yuyv422 min s=800x600 fps=5 max s=800x600 fps=24
[dshow @ 0000000004469360] pixel_format=yuyv422 min s=800x600 fps=5 max s=800x600 fps=24
[dshow @ 0000000004469360] pixel_format=yuyv422 min s=848x480 fps=5 max s=848x480 fps=30
[dshow @ 0000000004469360] pixel_format=yuyv422 min s=848x480 fps=5 max s=848x480 fps=30
[dshow @ 0000000004469360] pixel_format=yuyv422 min s=960x540 fps=5 max s=960x540 fps=15
[dshow @ 0000000004469360] pixel_format=yuyv422 min s=960x540 fps=5 max s=960x540 fps=15
[dshow @ 0000000004469360] pixel_format=yuyv422 min s=1024x576 fps=5 max s=1024x576 fps=15
[dshow @ 0000000004469360] pixel_format=yuyv422 min s=1024x576 fps=5 max s=1024x576 fps=15
[dshow @ 0000000004469360] pixel_format=yuyv422 min s=1280x720 fps=5 max s=1280x720 fps=10
[dshow @ 0000000004469360] pixel_format=yuyv422 min s=1280x720 fps=5 max s=1280x720 fps=10
[dshow @ 0000000004469360] pixel_format=yuyv422 min s=1600x896 fps=5 max s=1600x896 fps=7.5
[dshow @ 0000000004469360] pixel_format=yuyv422 min s=1600x896 fps=5 max s=1600x896 fps=7.5
[dshow @ 0000000004469360] pixel_format=yuyv422 min s=1920x1080 fps=5 max s=1920x1080 fps=5
[dshow @ 0000000004469360] pixel_format=yuyv422 min s=1920x1080 fps=5 max s=1920x1080 fps=5
[dshow @ 0000000004469360] vcodec=mjpeg min s=640x480 fps=5 max s=640x480 fps=30
[dshow @ 0000000004469360] vcodec=mjpeg min s=640x480 fps=5 max s=640x480 fps=30
[dshow @ 0000000004469360] vcodec=mjpeg min s=160x120 fps=5 max s=160x120 fps=30
[dshow @ 0000000004469360] vcodec=mjpeg min s=160x120 fps=5 max s=160x120 fps=30
[dshow @ 0000000004469360] vcodec=mjpeg min s=176x144 fps=5 max s=176x144 fps=30
[dshow @ 0000000004469360] vcodec=mjpeg min s=176x144 fps=5 max s=176x144 fps=30
[dshow @ 0000000004469360] vcodec=mjpeg min s=320x180 fps=5 max s=320x180 fps=30
[dshow @ 0000000004469360] vcodec=mjpeg min s=320x180 fps=5 max s=320x180 fps=30
[dshow @ 0000000004469360] vcodec=mjpeg min s=320x240 fps=5 max s=320x240 fps=30
[dshow @ 0000000004469360] vcodec=mjpeg min s=320x240 fps=5 max s=320x240 fps=30
[dshow @ 0000000004469360] vcodec=mjpeg min s=352x288 fps=5 max s=352x288 fps=30
[dshow @ 0000000004469360] vcodec=mjpeg min s=352x288 fps=5 max s=352x288 fps=30
[dshow @ 0000000004469360] vcodec=mjpeg min s=424x240 fps=5 max s=424x240 fps=30
[dshow @ 0000000004469360] vcodec=mjpeg min s=424x240 fps=5 max s=424x240 fps=30
[dshow @ 0000000004469360] vcodec=mjpeg min s=480x270 fps=5 max s=480x270 fps=30
[dshow @ 0000000004469360] vcodec=mjpeg min s=480x270 fps=5 max s=480x270 fps=30
[dshow @ 0000000004469360] vcodec=mjpeg min s=640x360 fps=5 max s=640x360 fps=30
[dshow @ 0000000004469360] vcodec=mjpeg min s=640x360 fps=5 max s=640x360 fps=30
[dshow @ 0000000004469360] vcodec=mjpeg min s=800x448 fps=5 max s=800x448 fps=30
[dshow @ 0000000004469360] vcodec=mjpeg min s=800x448 fps=5 max s=800x448 fps=30
[dshow @ 0000000004469360] vcodec=mjpeg min s=800x600 fps=5 max s=800x600 fps=30
[dshow @ 0000000004469360] vcodec=mjpeg min s=800x600 fps=5 max s=800x600 fps=30
[dshow @ 0000000004469360] vcodec=mjpeg min s=848x480 fps=5 max s=848x480 fps=30
[dshow @ 0000000004469360] vcodec=mjpeg min s=848x480 fps=5 max s=848x480 fps=30
[dshow @ 0000000004469360] vcodec=mjpeg min s=960x540 fps=5 max s=960x540 fps=30
[dshow @ 0000000004469360] vcodec=mjpeg min s=960x540 fps=5 max s=960x540 fps=30
[dshow @ 0000000004469360] vcodec=mjpeg min s=1024x576 fps=5 max s=1024x576 fps=30
[dshow @ 0000000004469360] vcodec=mjpeg min s=1024x576 fps=5 max s=1024x576 fps=30
[dshow @ 0000000004469360] vcodec=mjpeg min s=1280x720 fps=5 max s=1280x720 fps=30
[dshow @ 0000000004469360] vcodec=mjpeg min s=1280x720 fps=5 max s=1280x720 fps=30
[dshow @ 0000000004469360] vcodec=mjpeg min s=1600x896 fps=5 max s=1600x896 fps=30
[dshow @ 0000000004469360] vcodec=mjpeg min s=1600x896 fps=5 max s=1600x896 fps=30
[dshow @ 0000000004469360] vcodec=mjpeg min s=1920x1080 fps=5 max s=1920x1080 fps=30
[dshow @ 0000000004469360] vcodec=mjpeg min s=1920x1080 fps=5 max s=1920x1080 fps=30
[dshow @ 0000000004469360] Pin "Capture" (alternative pin name "1")
video=Logitech Webcam C930e: Immediate exit requested

Answer 1

谢谢，我可以通过链接 https://support.logitech.com/en_us/article/Install-native-UVC-drivers-for-your-Logitech-webcam?product=a0qi00000069v0MAAQ# 解决我的问题您从罗技提供。在我的情况下(我有一个 C920 网络摄像头，而不是 C930e)，在 Windows 7 PC 中它可以与 Logitech 驱动程序一起使用，但在 Windows 8.1 计算机中失败。

执行ffmpeg -f dshow -list_options true -i video="Logitech HD Pro Webcam C920"没有显示任何 h264 流。更改驱动程序后，相机名称中的 Logitech 名称丢失(只是“HD Pro Webcam C920”)，但现在检测到 h264 流并且 ffmpeg 可以记录它。