Just want to add a transparent logo to an MKV video

[pirtpx]

Hi

The only tool I was introduced to get the job done was Avisynth so I tried MeGUI and AvsPmod but both give me errors.

the script:

LoadPlugin("C:\Users\me\Desktop\MeGUI-2944-64\tools\lsmash\LSMASHSource.dll")
LSMASHVideoSource("C:\Users\me\Desktop\video.mp4")
#deinterlace
#crop
#resize
#denoise
Image=ImageSource("C:\Users\me\Desktop\logo.png",pixel_type="RGB32")
Overlay(last,Image,mask=Image.ShowAlpha(),x=10,y=10)

I get no error with the script above but the logo is too big so if I chain <.Spline16Resize(159,67)> to ImageSoure then it throws an error like "Could not read AVS frame" and the log says "Could not read frame: Filter Error: Attempted to request a planar frame that wasn't mod2 in width!"

I've never used Avisynth successfully so please any help would be really appreciated. I've spent hours without any success.

[davexnet]

It probably means you cannot use odd numbers on the resize, must be mod2 (even numbers)

[TubeBar]

I do all my production in FCP and Premier Pro for commercial purposes. Either can easily add a transparent logo or watermark but not free and high learning curve. Probably not for you.

I think ffmpeg can do it. Have a look at this thread https://stackoverflow.com/questions/39591675/ffmpeg-add-semi-transparent-watermarkpng-...different-size

[Secoast]

FFMPEG code.

ffmpeg -i input.mkv -i logo.png -filter_complex ^

[1]scale=VALUE[S];^

[S]format=argb,colorchannelmixer=aa=0.5[alpha];^

[0:v][alpha]overlay=x=10:y=10 output.mkv

0.5 alpha can be set between 0 and 1. Replace VALUE with logo desired size.

[pirtpx]

It probably means you cannot use odd numbers on the resize, must be mod2 (even numbers)

I do all my production in FCP and Premier Pro for commercial purposes. Either can easily add a transparent logo or watermark but not free and high learning curve. Probably not for you.

I think ffmpeg can do it. Have a look at this thread https://stackoverflow.com/questions/39591675/ffmpeg-add-semi-transparent-watermarkpng-...different-size

FFMPEG code.
...
0.5 alpha can be set between 0 and 1. Replace VALUE with logo desired size.

Thanks everyone. I got the desired result with no errors by changing the logo size but the whole time I thought it would be added as a new layer or a "logo filter" so there'd be no need to re-encode the whole file but I was simply wrong, it took so long

Anyway could you please let me know if there is any way to add a logo to mp4/mkv files without rencoding? No issue on my side if it would be "soft" i.e. could be easily turned off.

[jagabo]

I don't know if you can add an overlay track to an MKV file. But even if you can, I suspect most players will not support the feature. You could try using a graphic subtitle format (VOBSUB maybe, but limit color optoins) and forced subs.