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AboutRawData.txt
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AboutRawData.txt
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关于非压缩数据的说明
About Raw Data
雷霄骅 Lei Xiaohua
中国传媒大学/数字电视技术
Communication University of China / Digital TV Technology
http://blog.csdn.net/leixiaohua1020
本工程中包含的视音频数据都是没有文件头的原始数据，因此体积很大。为了保证工程打包后体积不
过于臃肿，只保留了几秒钟的视频数据（RGB，YUV）以及音频数据（PCM）。如果想要获得大段的
视音频数据，可以使用FFmpeg解码获得。下面列出几种获取视音频数据的方法。
（1）获取视频文件的YUV像素数据：
输入文件是in.flv，输出文件是out.yuv，输出的像素格式是yuv420p
ffmpeg -i in.flv -pix_fmt yuv420p out.yuv
（2）获取视频文件的RGB24像素数据：
输入文件是in.flv，输出文件是out.rgb，输出的像素格式是rgb24
ffmpeg -i in.flv -pix_fmt rgb24 out.yuv
（3）获取音频（或者视频文件中）的PCM采样数据：
输入文件是in.flv，输出文件是out.pcm，输出的音频采样格式是PCM 16bit Little Endian
ffmpeg -i in.flv -f s16le out.pcm
（4）像素数据之间的转换：
YUV420p转换为RGB24如下所示。输入文件是in_320x180.yuv，输出文件是out_320x180.rgb。
分辨率是320x180
ffmpeg -s 320x180 -pix_fmt yuv420p -i in_320x180.yuv -pix_fmt rgb24 -s 320x180 out_320x180.rgb
About Raw Audio/Video Data:
The size of raw audio/video data (no file header) is very big. So I only give several seconds of
raw video/audio data for test. The best way to get more raw data is to decode the compressed
video/audio using FFmpeg.
Here shows some of the commands:
(1)Get YUV pixel data
Input file is in.flv, Output file is out.yuv, Output pixel format is yuv420p
ffmpeg -i in.flv -pix_fmt yuv420p out.yuv
(2)Get RGB24 pixel data
Input file is in.flv, Output file is out.rgb, Output pixel format is rgb24
ffmpeg -i in.flv -pix_fmt rgb24 out.yuv
(3)Get PCM data
Input file is in.flv, Output file is out.pcm, Output sample format is PCM 16bit Little Endian
ffmpeg -i in.flv -f s16le out.pcm
(4)Convert between video's raw pixel data
YUV420p convert to RGB24. Input file is in_320x180.yuv, Output file is out_320x180.rgb.
Resolution is 320x180.
ffmpeg -s 320x180 -pix_fmt yuv420p -i in_320x180.yuv -pix_fmt rgb24 -s 320x180 out_320x180.rgb
下面示例说明像素数据的格式。
Raw Data's format is shown as follows:
test_rgb24_320x180.rgb
R1G1B1,R2G2B2,R3G3B3.....
test_bgr24_320x180.rgb
B1G1R1,B2G2R2,B3G3R3.....
test_bgra_320x180.rgb
B1G1R1A1,B2G2R2A2,B3G3R3A3.....
test_yuv420p_320x180.yuv
YYYYYYYYYY...
YYYYYYYYYY...
UUUUU...
VVVVV...
NocturneNo2inEflat_44.1k_s16le.pcm(16bit PCM, Stereo)：
L1L1,R1R1,L2L2,R2R2,L3L3,R3R3