我正在尝试使用 FFMpeg 从我的网络摄像头拍摄照片。
这就是我想运行的：
@echo off
:: Get date and time
for /F "usebackq tokens=1,2 delims==" %%i in (`wmic os get LocalDateTime /VALUE 2^>NUL`) do if '.%%i.'=='.LocalDateTime.' set ldt=%%j
set datetime=%ldt:~0,4%_%ldt:~4,2%_%ldt:~6,2%_%ldt:~8,2%_%ldt:~10,2%_%ldt:~12,2%
:: Capture snapshot through DirectShow using FFmpeg and save to disk.
ffmpeg.exe -f dshow -i video="1.3M WebCam" -vframes 1 D:\snapshot_%datetime%.jpg
输出：
ffmpeg version N-63746-gfbaf73a Copyright (c) 2000-2014 the FFmpeg developers
built on Jun 3 2014 22:10:20 with gcc 4.8.2 (GCC)
configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-av
isynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enab
le-iconv --enable-libass --enable-libbluray --enable-libcaca --enable-libfreetyp
e --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable-
libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libope
njpeg --enable-libopus --enable-librtmp --enable-libschroedinger --enable-libsox
r --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-decklink --enable-zlib
libavutil 52. 89.100 / 52. 89.100
libavcodec 55. 66.100 / 55. 66.100
libavformat 55. 42.100 / 55. 42.100
libavdevice 55. 13.101 / 55. 13.101
libavfilter 4. 5.100 / 4. 5.100
libswscale 2. 6.100 / 2. 6.100
libswresample 0. 19.100 / 0. 19.100
libpostproc 52. 3.100 / 52. 3.100
[dshow @ 0000000002ac0480] Could not run filter
video=1.3M WebCam: Input/output error
不知道问题出在哪里。
当我运行时ffmpeg -list_devices true -f dshow -i dummy，我得到：
ffmpeg version N-63746-gfbaf73a Copyright (c) 2000-2014 the FFmpeg developers
built on Jun 3 2014 22:10:20 with gcc 4.8.2 (GCC)
configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-av
isynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enab
le-iconv --enable-libass --enable-libbluray --enable-libcaca --enable-libfreetyp
e --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable-
libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libope
njpeg --enable-libopus --enable-librtmp --enable-libschroedinger --enable-libsox
r --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-decklink --enable-zlib
libavutil 52. 89.100 / 52. 89.100
libavcodec 55. 66.100 / 55. 66.100
libavformat 55. 42.100 / 55. 42.100
libavdevice 55. 13.101 / 55. 13.101
libavfilter 4. 5.100 / 4. 5.100
libswscale 2. 6.100 / 2. 6.100
libswresample 0. 19.100 / 0. 19.100
libpostproc 52. 3.100 / 52. 3.100
[dshow @ 00000000003103e0] DirectShow video devices
[dshow @ 00000000003103e0] "1.3M WebCam"
[dshow @ 00000000003103e0] DirectShow audio devices
[dshow @ 00000000003103e0] "Microphone (Realtek High Defini"
dummy: Immediate exit requested