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Sur d’autres sites (15688)

  • Revision 6a464eca05 : Speed up mode search depending on relative ref frame position This commit enabl

    18 août 2014, par Jingning Han

    Changed Paths :
     Modify /vp9/encoder/vp9_rdopt.c


     Modify /vp9/encoder/vp9_speed_features.c


     Modify /vp9/encoder/vp9_speed_features.h



    Speed up mode search depending on relative ref frame position

    This commit enables the encoder to record the location of the
    center frame to generate alter reference frame. It then allows to
    skip checking prediction modes of other reference frame types when
    it comes to encode this frame.

    The speed 3 runtime is reduced for the test sequences :
    bus at CIF 1000 kbps, 9791 ms -> 9446 ms, i.e., 3.5% speed-up,
    pedestrian at 1080p 2000 kbps, 184043 ms -> 175730 ms, i.e., 4.5%
    speed-up.

    No compression performance change observed.

    Change-Id : Iacfde3bcc1445964e7a241f239bd6ea11cb94bd1

  • Revision eca93642e2 : Add a speed feature to give the tighter search range Add a speed feature to giv

    14 août 2014, par Pengchong Jin

    Changed Paths :
     Modify /vp9/encoder/vp9_encodeframe.c


     Modify /vp9/encoder/vp9_speed_features.c


     Modify /vp9/encoder/vp9_speed_features.h



    Add a speed feature to give the tighter search range

    Add a speed feature to give the tighter partition search
    range. Before partition search, calculate the histogram
    of the partition sizes of the left, above and previous
    co-located blocks of the current block. If the variance of
    observed partition sizes is small enough, adjust the search
    range around the mean partition size, which will be tigher.

    The feature is currently turned on at speed 2. Experiments on
    sample youtube clips show on average the runtime is reduced
    by 3-7%.

    For hard stdhd clips :
    park_joy_1080p @ 15000kbps : 509251 ms -> 491953 ms (3.3%)
    pedestrian_area_1080p @ 2000kbps : 223941 ms -> 214226 ms (4.3%)

    The PSNR performance is changed :
    derf : -0.112%
    yt : -0.099%
    hd : -0.090%
    stdhd :-0.102%

    Change-Id : Ie205ec5325bf92ec5676c243e30ba9d0adca10f2

  • Revision af2a736953 : Merge "Speed up mode search depending on relative ref frame position"

    19 août 2014, par Jingning Han

    Merge "Speed up mode search depending on relative ref frame position"

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