Have you updated your debian2409? I remember that debian2409 had 1-2 hardware decoding related software driver updates since its release in September last year. Updated in StarFive Library.
Also, have you tested with debian2409pro? Debian2409pro is an upgrade from debian2409 to debian13 (retaining the normal operation of GPU VPU driver), and ffmpeg should be updated to the updated version.
I confirm that VF2 video hardware decoding uses VPU, local video hardware decoding requires the original VLC version, and streaming media hardware decoding requires the original Firefox 119. Starfive seems to have not disclosed in detail the method for setting up VPU.
