Hi Nicolas, Thank you for your replies. I have finally been able to
successfully use the freezedetect command. With a little bit of google
searching, I was able to find examples that allowed me to make some
limited use of freezedetect, even though I still do not understand some
of the options. For me, the freezedetect documentation is frustrating
because some of the command flags or options are not documented. Also,
the data types and data formats are not documented.
These flags or options have very limited documentation. Some have no
documentation.
-i
-vf
metadata=
mode=
file=
-map
-f
n=
d=
Using only the ffmpeg documentation on the website and in the --help
file, most users will not be able to successfully use the freezedetect
command. For example, I would never guess that the n= option can accept
as input two different data formats. The user can specify noise in
decimal, i.e. n=0.0001. The user can also specify noise in db, i.e.
n=-50dB. In addition, most users would never be able to guess how to
construct the command. The documentation does not explain which options
should be enclosed in quotation marks, or which options should be
separated by a comma, and which options should be separated by a colon.
The meaning of the trailing dash is not explained.
ffmpeg -i input_file.mp4 -vf
"freezedetect=n=0.0001:d=0.05,metadata=mode=print:file=output_file.txt"
-map 0:v:0 -f null -
Using ffmpeg is not as difficult as reverse engineering thousands of
years old Egyptian hieroglyphics, but some more complete documentation
would still be helpful for many users.
Thanks for considering my feedback.
-Elliot
https://ffmpeg.org/ffmpeg-filters.html#freezedetect
I have never used the freedetect filter, but the documentation seems
quite clear. Your file is 30fps, so I guess if you set d=0.067, this
would detect a 2-frame freeze ? Just try and see if you get something
meaningful to you or not.
Nicolas
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