问题
I am trying to figure out if a certain user-uploaded file is a video file.
I first tried ffprobe,
# a png file
Input #0, png_pipe, from '<file>':
Duration: N/A, bitrate: N/A
Stream #0:0: Video: png, rgba(pc), 920x2094 [SAR 4724:4724 DAR 460:1047], 25 tbr, 25 tbn, 25 tbc
# a text file
Input #0, tty, from '<file>':
Duration: 00:00:00.24, bitrate: 40 kb/s
Stream #0:0: Video: ansi, pal8, 640x400, 25 fps, 25 tbr, 25 tbn, 25 tbc
# a video file
Input #0, matroska,webm, from '<file>':
Metadata:
encoder : libebml v1.3.5 + libmatroska v1.4.8
creation_time : 2017-12-12T20:18:42.000000Z
<redacted>
but it's too hard to figure out what's what. Even image files and text files count as a video.
Should I compare the output matroska,webm, with every codec ffmpeg supports or is there a better way to do this?
回答1:
Using ffprobe:
ffprobe -v error -select_streams v:0 -show_entries stream=codec_type -of csv=p=0 input.mkv
Outputs either video or no output at all.
The problem is that ffprobe considers images to be video, so you can additionally/alternatively use codec_name to help determine the type:
ffprobe -v error -select_streams v:0 -show_entries stream=codec_name,codec_type -of default=nw=1 input.png
Outputs:
codec_name=png
codec_type=video
回答2:
Assuming your system supports the file command, you can pass -i, --mime option to get the mime type of the file and isolate it before processing with ffmpeg:
# a video file
$ file -i movie.mp4 | cut -d ' ' -f2 | cut -d '/' -f1
--> video
(Credit for cut command).
来源：https://stackoverflow.com/questions/56397732/how-can-i-know-a-certain-file-is-a-video-file