FFMpeg: can either resize or denoise video, but not both.

[junglemike]

I'm using latest FFMpeg. My goal is to encode video in x265, sometimes I need to denoise and resize the video.

I try to resize the video and encode to x265 - works OK. Video is resized

ffmpeg.exe -i d:\Camera\sample1.avi  -vf scale=640:360 -preset medium -c:v libx265 -an -x265-params crf=26 d:\Test\sample1_resized.mkv

I try to apply denoising without resizing - works OK. I can see the size is little slower than without -filter. So filter is at least doing something.

ffmpeg.exe -i d:\Camera\source1.avi -filter:v hqdn3d=4.0:3.0:6.0:4.5 -preset medium -c:v libx265 -an -x265-params crf=26 d:\Test\sample1_filtered.mkv

Here I try to resize AND apply filter:

ffmpeg.exe -i d:\Camera\source1.avi -filter:v hqdn3d=4.0:3.0:6.0:4.5 -vf scale=360:200 -preset medium -c:v libx265 -an -x265-params crf=26 d:\Test\sample1_resize_filter.mkv

Video does gets resized but filter is NOT applied. I can tell this because video is the same bit by bit as the one that is resized with no filtering.

What am I doing wrong?

[poisondeathray]

Use a comma to separate filters in a sequential chain

In this example, hqdn3d is applied before the scale

-filter:v hqdn3d=4.0:3.0:6.0:4.5,scale=360:200

[pandy]

What am I doing wrong?

You not reading FM... https://ffmpeg.org/ffmpeg-filters.html#Filtergraph-syntax-1 side to this there is plenty examples on internet https://trac.ffmpeg.org/wiki/FilteringGuide

[junglemike]

Thanks! Fixed it.