如何快速确定视频中的位置？

2024-9-20 • tag-icon

如何快速确定视频中的位置？例如，我有一个视频文件，它看起来像这样。

我想使用 ffmpeg 裁剪视频并将黑框中的部分作为新视频。但首先我需要获取黑框的左上角位置及其宽度和高度。我怎样才能轻松做到这一点？现在这就是我所做的。首先我使用它ffprobe来获取实际视频大小：

I:\tutorial\Juggling - Step By Step [4 Vols]>ffprobe "Juggling - Step by Step (2 of 4) [VHS-Rip].avi"
ffprobe version N-103679-g7bbad32d5a-20210918 Copyright (c) 2007-2021 the FFmpeg developers
  built with gcc 10-win32 (GCC) 20210408
  configuration: --prefix=/ffbuild/prefix --pkg-config-flags=--static --pkg-config=pkg-config --cross-prefix=x86_64-w64-mingw32- --arch=x86_64 --target-os=mingw32 --enable-gpl --enable-version3 --disable-debug --disable-w32threads --enable-pthreads --enable-iconv --enable-libxml2 --enable-zlib --enable-libfreetype --enable-libfribidi --enable-gmp --enable-lzma --enable-fontconfig --enable-libvorbis --enable-opencl --enable-libvmaf --enable-vulkan --disable-libxcb --disable-xlib --enable-amf --enable-libaom --enable-avisynth --enable-libdav1d --enable-libdavs2 --disable-libfdk-aac --enable-ffnvcodec --enable-cuda-llvm --enable-frei0r --enable-libglslang --enable-libgme --enable-libass --enable-libbluray --enable-libmp3lame --enable-libopus --enable-libtheora --enable-libvpx --enable-libwebp --enable-lv2 --enable-libmfx --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-librav1e --enable-librubberband --enable-schannel --enable-sdl2 --enable-libsoxr --enable-libsrt --enable-libsvtav1 --enable-libtwolame --enable-libuavs3d --disable-libdrm --disable-vaapi --enable-libvidstab --enable-libx264 --enable-libx265 --enable-libxavs2 --enable-libxvid --enable-libzimg --enable-libzvbi --extra-cflags=-DLIBTWOLAME_STATIC --extra-cxxflags= --extra-ldflags=-pthread --extra-ldexeflags= --extra-libs=-lgomp --extra-version=20210918
  libavutil      57.  5.101 / 57.  5.101
  libavcodec     59.  7.103 / 59.  7.103
  libavformat    59.  5.100 / 59.  5.100
  libavdevice    59.  0.101 / 59.  0.101
  libavfilter     8.  9.100 /  8.  9.100
  libswscale      6.  1.100 /  6.  1.100
  libswresample   4.  0.100 /  4.  0.100
  libpostproc    56.  0.100 / 56.  0.100
Input #0, avi, from 'Juggling - Step by Step (2 of 4) [VHS-Rip].avi':
  Metadata:
    software        : VirtualDubMod 1.5.4.1 (build 2178/release)
  Duration: 00:33:09.92, start: 0.000000, bitrate: 1266 kb/s
  Stream #0:0: Video: mpeg4 (Advanced Simple Profile) (XVID / 0x44495658), yuv420p, 448x336 [SAR 1:1 DAR 4:3], 1116 kb/s, 25 fps, 25 tbr, 25 tbn
  Stream #0:1: Audio: mp3 (U[0][0][0] / 0x0055), 48000 Hz, stereo, fltp, 137 kb/s

I:\tutorial\Juggling - Step By Step [4 Vols]>