vpxenc

Defaults:

vpxenc --passes=1 -v --webm transformers.y4m -o vpxenc_defaults.webm

Codec: WebM Project VP9 Encoder v1.5.0
Source file: transformers.y4m File Type: Y4M Format: I420
Destination file: vpxenc_defaults.webm
Encoder parameters:
    g_usage                      = 0
    g_threads                    = 8
    g_profile                    = 0
    g_w                          = 720
    g_h                          = 480
    g_bit_depth                  = 8
    g_input_bit_depth            = 8
    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            = 0
    rc_scaled_width              = 0
    rc_scaled_height             = 0
    rc_resize_up_thresh          = 60
    rc_resize_down_thresh        = 30
    rc_end_usage                 = 0
    rc_target_bitrate            = 256
    rc_min_quantizer             = 0
    rc_max_quantizer             = 63
    rc_undershoot_pct            = 25
    rc_overshoot_pct             = 25
    rc_buf_sz                    = 6000
    rc_buf_initial_sz            = 4000
    rc_buf_optimal_sz            = 5000
    rc_2pass_vbr_bias_pct        = 50
    rc_2pass_vbr_minsection_pct  = 0
    rc_2pass_vbr_maxsection_pct  = 2000
    kf_mode                      = 1
    kf_min_dist                  = 0
    kf_max_dist                  = 149

Setting end usage to q (quality):

rc_end_usage = 3 is the only difference.

vpxenc --end-usage=q --passes=1 -v --webm -o vpxenc_q.webm video.y4m

Codec: WebM Project VP9 Encoder v1.5.0
Source file: transformers.y4m File Type: Y4M Format: I420
Destination file: vpxenc_q.webm
Encoder parameters:
    g_usage                      = 0
    g_threads                    = 8
    g_profile                    = 0
    g_w                          = 720
    g_h                          = 480
    g_bit_depth                  = 8
    g_input_bit_depth            = 8
    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            = 0
    rc_scaled_width              = 0
    rc_scaled_height             = 0
    rc_resize_up_thresh          = 60
    rc_resize_down_thresh        = 30
    rc_end_usage                 = 3
    rc_target_bitrate            = 256
    rc_min_quantizer             = 0
    rc_max_quantizer             = 63
    rc_undershoot_pct            = 25
    rc_overshoot_pct             = 25
    rc_buf_sz                    = 6000
    rc_buf_initial_sz            = 4000
    rc_buf_optimal_sz            = 5000
    rc_2pass_vbr_bias_pct        = 50
    rc_2pass_vbr_minsection_pct  = 0
    rc_2pass_vbr_maxsection_pct  = 2000
    kf_mode                      = 1
    kf_min_dist                  = 0
    kf_max_dist                  = 149