, specifically in a high-quality video format like libvpx (VP9).
If you are using a Vera S05 (or any S05-based device like the Khadas VIM1 or similar Amlogic S905X2 boards) for media encoding or transcoding, you have likely hit a wall: software encoding is slow, but hardware encoding looks bad. vera s05 libvpx best
Row-MT: Enable with -row-mt 1 to improve multi-threading performance on modern CPUs. , specifically in a high-quality video format like
ffmpeg -i input.mp4 -c:v libvpx-vp9 -b:v 2M -pass 1 -an -f webm /dev/null
| Flag | Setting | Why “Best” |
|------|---------|-------------|
| -b:v 0 | Disable target bitrate | Allows CRF to drive quality. |
| -crf 18 | Constant Quality | 15–20 yields visually lossless. Lower = larger file. |
| -speed 2 | Encoding speed | 0 = slowest/best, 2 = sweet spot for VOD. |
| -tile-columns 4 | Parallelism | Improves multi-thread decode. Set to log2(cores). |
| -row-mt 1 | Row-based multi-threading | Better CPU utilization. |
| -lag-in-frames 25 | Lookahead | Essential for rate control and alt-ref frames. |
| -auto-alt-ref 1 | Enable alt-ref frames | Boosts quality for static/dark scenes. |
| -quality good | Good (vs best, realtime) | Best for non-realtime VOD. | Explanation of Flags | Flag | Setting |
In the world of open-source hardware and video transcoding, the Vera S05 (often powered by the Allwinner V系列 SoC or similar ARM architecture) has carved out a niche as a low-power, cost-effective solution for edge computing and media streaming. Meanwhile, Libvpx remains the gold-standard open-source encoder for the VP8 and VP9 codecs, critical for modern web video (WebM) and adaptive streaming.