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• why is powershell stripping the first "-" in my arguments to ffmpeg [duplicate]

  12 décembre 2022, par robynChill

  Here is a simplified version of the powershell script I'm trying to write to join some .mp4 files :

  


  [string]$inputs = ""
$filenames = "input1.mp4", "input2.mp4", "input3.mp4"
foreach ($f in $filenames) {
    $inputs += "-i $f "
}
Write-Host $inputs
.\bin\ffmpeg.exe $inputs -filter_complex...


  


  The write-host prints out the string like I expect, but then ffmpeg gives me an error that says :

  


  


  Unrecognized option 'i input1.mp4 -i input2.mp4 -i input3.mp4 '.
Error splitting the argument list : Option not found

  


  


  So it looks like when the arguments are being passed to cmd.exe to be passed to ffmpeg, something is getting lost (at least that's how I think it works). I've read other questions that talk about problems with passing double-quotes in arguments, but my problem is with -. Can someone explain what is going in my case ? I don't think it's an escaping issue since the second and third - look like they're being passed. Also, if I just use start-process with the -argumentList option (and prepare one big $arguments string beforehand) then everything works.

  


• Is there a built-in audio preprocessing within Android OS ?

  29 août 2022, par Larry lu

  I am running a dev team to build an Android application the major feature is to record a user's voice and merge it into a long movie. It's a dub film application.

  


  One struggle thing to my dev team is whether the Android OS pre-processes the recorded audio file. because we want the very original audio data from the built-in Microphone.
If there is a built-in pre-processing inside of Android OS that keeps updating some data of the recorded audio file, we want to know what is changed. We can't find any official post from Android speaking about it but would like to confirm from a professional.

  


  Many thanks

  


• How to do filter twice at different time ffmpeg

  29 décembre 2022, par Мохамед Русланович

  Am trying to implement overlay twice but at different position and different time
Here is what am trying to do :
i just duplicate the filter

  


  ffmpeg -t 50 -y -i film.mp4 -stream_loop -1 -i gif.gif -filter_complex "


[1]colorchannelmixer=aa=1,scale=iw*2:-1[a];[0][a]overlay=x='200':y='300':shortest=1:enable='between(t,0,10)';

[1]colorchannelmixer=aa=1,scale=iw*2:-1[b];[0][b]overlay=x='200':y='300':shortest=1:enable='between(t,15,20)'"  

-acodec copy output_task_3.mp4


  


  But only the first overlay is been implemented, the seconds is not !

  


  how to archive this ?

  


  Now i wrote a PHP script that dose this filter once each time, and repeat proccess then merge all videos, but this is taking so long.