[FFmpeg-user] How to filter time dependent

[Michael Koch]

Am 24.04.2021 um 19:24 schrieb Michael Koch:
> Am 23.04.2021 um 23:19 schrieb Ulf Zibis:
>>
>> Am 23.04.21 um 08:31 schrieb Gyan Doshi:
>>>
>>> On this topic generally, see https://superuser.com/q/1632998/
>> Much thanks for this hint. I was successful with this approach:
>>
>> ffmpeg -i 'Stille Tage in Clichy.mpg' -vf 
>> "split=3[a][b][c];[a]trim=0:2888.36,setpts=PTS-STARTPTS,crop=352:496:0:36[a];[b]trim=2888.36:3293.96,setpts=PTS-STARTPTS,crop=352:496:0:42[b];[c]trim=3293.96,setpts=PTS-STARTPTS,crop=352:496:0:38[c];[a][b][c]concat=n=3:v=1:a=0",scale=iw:ih/2,hqdn3d=2:1.5:12 
>> -preset slow -movflags +faststart 'Stille Tage in 
>> Clichy_c_3_scale_1_2_hqdn3d_2_1_12_slow.mp4'
>
>
> You can simplify this by using sendcmd:
>
> ffmpeg -i input.mp4 -vf 
> "sendcmd=f=test.cmd,crop at 1=352:496:0:36,scale=iw:ih/2,hqdn3d=2:1.5:12 
> out.mp4

I forgot the quotation mark " at the end of the filter chain:

ffmpeg -i input.mp4 -vf 
"sendcmd=f=test.cmd,crop at 1=352:496:0:36,scale=iw:ih/2,hqdn3d=2:1.5:12" 
out.mp4

"@1" can be omitted if there is only one crop filter in the filter chain.

Michael