2018-01-06 20:38 GMT+01:00 *** <[email protected]>: > Somewhere I discovered that ffmpeg will create essence > MD5s for supported still image formats.
And audio and video. (From FFmpeg's pov, an image format is a video format.) > I began using the following command to verify that > the image essence did not change in photos after > their IPTC metadata is revised. > Because there is no documentation of such a use case > on the ffmpeg site nor anywhere else on the web I have > begun to doubt that this is a valid use of ffmpeg or this > command. Different possibilities exist within FFmpeg to calculate checksums, the FFmpeg regression tests are a usage example. > Is anyone else doing this? Many people are. > Even if you aren’t I would appreciate any comments or > observations that you care to share. > > ffmpeg -i INPUT -map 0:v -f md5 OUTPUT.md5 This command line will calculate the md5sum of the first video stream in the input file. You may want to look at the framemd5 muxer for other use-cases, other algorithms also exist. Carl Eugen _______________________________________________ ffmpeg-user mailing list [email protected] http://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email [email protected] with subject "unsubscribe".
