• Yunqing Wang's avatar
    Multiple-resolution encoder · aa7335e6
    Yunqing Wang authored
    The example encoder down-samples the input video frames a number of
    times with a down-sampling factor, and then encodes and outputs
    bitstreams with different resolutions.
    Support arbitrary down-sampling factor, and down-sampling factor
    can be different for each encoding level.
    For example, the encoder can be tested as follows.
    1. Configure with multi-resolution encoding enabled:
    ../libvpx/configure --target=x86-linux-gcc --disable-codecs
    --enable-vp8 --enable-runtime_cpu_detect --enable-debug
    --disable-install-docs --enable-error-concealment
    2. Run make
    3. Encode:
    If input video is 1280x720, run:
    ./vp8_multi_resolution_encoder 1280 720 input.yuv 1.ivf 2.ivf 3.ivf 1
    (output: 1.ivf(1280x720); 2.ivf(640x360); 3.ivf(320x180).
    The last parameter is set to 1/0 to show/not show PSNR.)
    4. Decode:
    ./simple_decoder 1.ivf 1.yuv
    ./simple_decoder 2.ivf 2.yuv
    ./simple_decoder 3.ivf 3.yuv
    5. View video:
    mplayer 1.yuv -demuxer rawvideo -rawvideo w=1280:h=720 -loop 0 -fps 30
    mplayer 2.yuv -demuxer rawvideo -rawvideo w=640:h=360 -loop 0 -fps 30
    mplayer 3.yuv -demuxer rawvideo -rawvideo w=320:h=180 -loop 0 -fps 30
    The encoding parameters can be modified in vp8_multi_resolution_encoder.c,
    for example, target bitrate, frame rate...
    Modified API. John helped a lot with that. Thanks!
    Change-Id: I03be9a51167eddf94399f92d269599fb3f3d54f5