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24th November 2011, 01:20 | #1 | Link |
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Trying some real-world WebM tests
So, there's been a whole lot of talk about WebM's viability a technology and ecosystem, but I've not seen a good head-to-head comparing the latest vpxenc and x264 versions.
I'm starting off with 720p30 "best" perceptual quality, not worring about encoding time. Getting apples-to-apples is tricky, particularly in rate control. I'm trying to compare a High 4.0 encode to VP8, at 3Mbps with VBR and other constraints appropriate for Level 4.0. Beyond rate control, I want to allow each codec to use its different bitstream and encoder features as best possible. I want to see what each can do in terms of quality, and what each requires in terms of decoder performance. For WebM: Code:
Hawaii_720p30_overlay_stereo.avi -o Hawaii_vp8test.webm --best -w 1280 -h 720 --target-bitrate=3000 -p 2 --end-usage=vbr --buf-sz=8333 --maxsection-pct=833 --buf-initial-sz=750 --buf-optimal-sz=8333 --kf-max-dist=240 --auto-alt-ref=1 --lag-in-frames=25 --tune=ssim --threads=4 --fps=30000/1001 --resize-allowed=1 --verbose --psnr Code:
Encoder parameters: g_usage = 0 g_threads = 4 g_profile = 0 g_w = 1280 g_h = 720 g_timebase.num = 1 g_timebase.den = 1000 g_error_resilient = 0 g_pass = 0 g_lag_in_frames = 25 rc_dropframe_thresh = 0 rc_resize_allowed = 1 rc_resize_up_thresh = 60 rc_resize_down_thresh = 30 rc_end_usage = 0 rc_target_bitrate = 3000 rc_min_quantizer = 4 rc_max_quantizer = 63 rc_undershoot_pct = 100 rc_overshoot_pct = 100 rc_buf_sz = 8333 rc_buf_initial_sz = 750 rc_buf_optimal_sz = 8333 rc_2pass_vbr_bias_pct = 50 rc_2pass_vbr_minsection_pct = 0 rc_2pass_vbr_maxsection_pct = 833 kf_mode = 1 kf_min_dist = 0 kf_max_dist = 240 Code:
--level 4 --preset placebo --tune film --pass 3 --bitrate 3000 --keyint 240 --open-gop --ref 9 --slices 1 |
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h.264, vp8, webm, x264 |
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