Using FFmpegFrameFilter with zscale and tonemapping

[GoPenguins]

When I attempt to create the following filter:

"zscale=t=linear:npl=100,format=gbrpf32le,zscale=p=bt709,tonemap=tonemap=mobius:desat=0,zscale=t=bt709:m=bt709:r=tv,format=yuv420p,scale=1920:1080"

the filter throws an exception when attempting to start:

org.bytedeco.javacv.FrameFilter$Exception: avfilter_graph_parse_ptr() error -22

The filter in question works fine from ffmpeg command line, but I'm using this filter with frame grabber. Any suggestions?

[saudet]

What are the error messages from the log?

[GoPenguins]

Sorry, I forgot to attach... Pretty sure this is what you are looking for

No such filter: 'zscale'

[saudet]

Ok, so we would need to enable it in the build. Contributions are welcome, so please do send a pull request if you get it working! Let me know if you have any questions though. Thanks

[b005t3r]

I guess this still hasn't been changed? The lack of zscale filter makes converting HDR videos impossible.

Enabling this shouldn't be that difficult:

To enable compilation of this filter, you need to configure FFmpeg with --enable-libzimg

http://underpop.online.fr/f/ffmpeg/help/zscale.htm.gz

[callisto-jovy]

As converting HDR videos would be very handy and there has not been an update yet, would it be possible to include the flag in the next release?

[saudet]

Contributions are welcome! Please open a pull request with the change

[callisto-jovy]

Contributions are welcome! Please open a pull request with the change

Will do!

[b005t3r]

So what's the status of this? I guess it still hasn't been resolved?

[b005t3r]

I created a pull request for this, should fix the issue:

bytedeco/javacpp-presets#1448

[callisto-jovy]

So what's the status of this? I guess it still hasn't been resolved?

Sorry, I haven't been able to get to the issue for some time now. I'll try to fix the remaining cases next week.

[b005t3r]

@callisto-jovy were you able to make any progress on this?