Luma value in a TXT file

[barabba2005]

Ha all.

Is possible get a file with Luma value frame by frame from a clip?

Thanks in advance.

[pandy]

Regular ffmpeg can do this trough

ffmpeg -v quiet -stats -i "%1" -vf:? "signalstats,metadata=print:file='v.%~n1.txt'"

- have no Apple so don't know if this is possible by ffmpegx.

[barabba2005]

Hi Pandy

In this moment i'm working with PC

With:
ffmpeg -v warning -stats -i 59.mp4 -vf "signalstats,metadata=print:file='v.%~n1.txt'"

program say me:
Trailing options were found on the commandline.
At least one output file must be specified

[pandy]

Hi Pandy

In this moment i'm working with PC

With:
ffmpeg -v warning -stats -i 59.mp4 -vf "signalstats,metadata=print:file='v.%~n1.txt'"

program say me:
Trailing options were found on the commandline.
At least one output file must be specified

Try something like:

@setlocal
@set name=59.mp4
@ffmpeg -v warning -stats -i "%name%" -vf:? "signalstats,metadata=print:file='v.%name%.txt'"
@endlocal
@exit

or explicitly use name in output result like:

@ffmpeg -v warning -stats -i "59.mp4" -vf:? "signalstats,metadata=print:file='v.59.mp4.txt'"

You receive error due replacing argument for batch with real name but remain part of script is not changed to so filename is unknown - no valid name at the output - i usually avoid hardcoding filename in script and provide filename as argument to script - assuming that script is named ffvideostat.cmd then i call my script like this ffvideostat "myvideofilename.mp4" and result will use name and extenssion like this v.myvideofilename.mp4.txt


btw in future try to use different forum - ffmpegx is forum focused on particular application (ffmpegx which is not popular in Windows world as much as on Apple world).

[barabba2005]

OK

Unfortunately it doesn't write TXT file

Do you know a Windows forum with a lot experience like this?

Thanks a lot

[pandy]

Search videohelp where ffmpeg questions are solved, general discussion looks OK IMHO.

And my fault. please add

-f null -

at the end

whole command should look like this

@ffmpeg -v warning -stats -i "59.mp4" -vf:? "signalstats,metadata=print:file='v.59.mp4.txt'" -f null -

sorry for too quick copy&paste - this was my original batch and i simply forget to tell ffmpeg output - apologies.

@ffmpeg -v quiet -stats -i "%1" -vf:? "signalstats,metadata=print:file='v.%~n1.txt'" -af:? "astats=metadata=1:reset=1,ametadata=print:file='a.%~n1.txt'" -f null -

[barabba2005]

Thanks a lot.