[FFmpeg-user] sendcmd and overlay

[Michael Koch]

Am 01.02.2020 um 22:35 schrieb Paul B Mahol:
> On 2/1/20, Michael Koch <astroelectronic at t-online.de> wrote:
>>>>> Console output:
>>>>>
>>>>> F:\Test>c:\ffmpeg\ffmpeg -i main.mov -i lp.mp4 -filter_complex "[1
>>>>> ]scale=100:100,sendcmd=f=test.cmd[2];[0][2]overlay=x='':y=''" -q:v 2 -t
>>>>> 4 -y out
>>>> x="":y="" are invalid arguments. They must be valid, even if they not
>>>> gonna be used later.
>>> now it works. Thank you!
>>>
>> Should be added to sendcmd documentation:
>>
>> -- An example which shows where to insert the sendcmd filter, if the
>> target filter has more than one input.
>> -- All arguments of filters must be initialized with valid values, even
>> if they are never used because sendcmd overwrites them.
>>
> patch welcome

sorry, I never figured out how git works. Too complicated for me.

Another idea: Could sendcmd be modified so that it can be inserted at 
any place in the filter chain, regardless of the number of inputs?

Michael