# Bad (results in "blobby" portal) vpxenc input.y4m -o output.webm --codec=vp9 --loopfilter=1 vpxenc input.y4m -o output.webm --codec=vp9 --loopfilter=0 --sharpness=7 4. Bitrate Analysis (Simulated) Assuming a target resolution of 1920x1080 (1080p):
| Codec | Bitrate (Mbps) | VMAF Score (Estimated) | File Size (22 min) | Notes | | :--- | :--- | :--- | :--- | :--- | | H.264 (High) | 8.0 | 95 | 1.32 GB | Reference | | libvpx VP9 (CrF) | | 93 | 396 MB | Preferred for web | | libvpx VP9 (2-pass) | 1.8 | 91 | 297 MB | Risky; banding in Shoney's scene | rick and morty s03e01 libvpx
| Scene Type | Timestamp | Encoding Challenge for libvpx | Recommended libvpx Flag | | :--- | :--- | :--- | :--- | | | 00:02:15 | Low motion, flat blue/gray colors. Easy for compression. | --aq-mode=1 (Variance) | | The Shoney’s Heist | 00:05:30 | Large areas of white (Rick’s coat) + text (menu board). | --sharpness=5 (Preserve text edges) | | Saving Summer (Car Chase) | 00:12:00 | High speed, scrolling backgrounds. Causes keyframe overflow if not tuned. | --auto-alt-ref=1 | | Portal Fluid Explosion | 00:18:45 | High entropy (green liquid splatter). libvpx may blur edges. | --enable-tpl-model=1 | | End Credits (Post-Credits Szechuan) | 00:21:30 | Static background + moving sauce packet. | --static-thresh=1000 | 3. Critical Analysis: The “Portal Problem” Issue: The interdimensional portal fluid (bright green/yellow, glowing, irregular edges) is a worst-case scenario for VP9’s loop filter. # Bad (results in "blobby" portal) vpxenc input
Use CrF (Constrained Quality) mode between 20-25 for this episode. Due to the flat colors (e.g., Jerry’s gray tunic), CrF 30 will cause visible banding in the sky during the opening shot. 5. Specific libvpx Tuning for S03E01 To encode this episode as a WebM for archival or streaming: | --aq-mode=1 (Variance) | | The Shoney’s Heist