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| author | Yunqing Wang <yunqingwang@google.com> | 2011-10-25 15:14:16 -0400 |
|---|---|---|
| committer | Yunqing Wang <yunqingwang@google.com> | 2011-12-05 17:59:42 -0500 |
| commit | aa7335e610b961626f77130bc99b24de1031601d (patch) | |
| tree | cfdd17dd049a005e30ec8d515fd6d303e035754c /usage_cx.dox | |
| parent | 6127af60c1eb4f20b03a4a34eb53704592194bed (diff) | |
| download | libvpx-aa7335e610b961626f77130bc99b24de1031601d.tar.gz libvpx-aa7335e610b961626f77130bc99b24de1031601d.tar.bz2 libvpx-aa7335e610b961626f77130bc99b24de1031601d.zip | |
Multiple-resolution encoder
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
--enable-multi-res-encoding
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
Diffstat (limited to 'usage_cx.dox')
| -rw-r--r-- | usage_cx.dox | 3 |
1 files changed, 1 insertions, 2 deletions
diff --git a/usage_cx.dox b/usage_cx.dox index 980a03461..62f3e450b 100644 --- a/usage_cx.dox +++ b/usage_cx.dox @@ -1,6 +1,6 @@ /*! \page usage_encode Encode - The vpx_codec_encode() function is at the core of the decode loop. It + The vpx_codec_encode() function is at the core of the encode loop. It processes raw images passed by the application, producing packets of compressed data. The <code>deadline</code> parameter controls the amount of time in microseconds the encoder should spend working on the frame. For @@ -10,5 +10,4 @@ \ref samples - */ |