Add AMD support via ort alternative to trt

src/nodes/frame_source_node.hpp

@@ -14,7 +14,8 @@
 // ── FrameSourceFunc ───────────────────────────────────────────────────────────
 // KPN source node: reads a movie file and emits one Frame per sample interval.
 //
-// Decode backend: FFmpeg with NVDEC (_cuvid) when available, CPU otherwise.
+// Decode backend: FFmpeg hwaccel (CUDA/VAAPI, runtime-detected) when
+// available, CPU otherwise.
 //
 // Sampling strategy: seek to the next target timestamp rather than decoding
 // every frame, which is fast even for 1-FPS sampling of a 2-hour film.
@@ -39,7 +40,7 @@ struct FrameSourceFunc {
                          - cfg.start_sec;
         int n_frames = static_cast<int>(span_s * cfg.sample_fps);
         std::cerr << "[frame_source] decoder=" << decoder_->codec_name()
-                  << " (" << (decoder_->hw_active() ? "NVDEC" : "CPU") << ")"
+                  << " (" << decoder_->hw_backend() << ")"
                   << "  video_fps=" << decoder_->fps()
                   << "  start=" << cfg.start_sec << "s"
                   << (end_sec_ > 0 ? "  end=" + std::to_string(end_sec_) + "s" : "")