屏幕录制VB源码.rar

Readme for avi2mpg1 ver 1.4 This program is distributed under the GNU copyright, please see the accompanying file COPYING for details. Please note that only the changes to the original source code are copyrighted under GNU, except for the the multiplexer portions, which are also under the GNU copyright. The copyrights for the other two source programs, the video and audio encoders are detailed in their respective source, as well as the original distributions. avi2mpg1 is a simple command line mpeg-1 encoder that runs at the command prompt under Windows '95 or NT. Copy the file avi2mpg1.exe to any directory in your path. C:\WINDOWS\COMMAND or C:\WINNT should work for most people. Invoke the program with the following syntax: usage: avi2mpg1 [-options] inputfile.avi [outputfile.mpg] where: options can be: -b byterate Where byterate is total system stream rate in KBytes/s (default 150) Valid range = 10 to 500. -s bitrate Where bitrate is total system stream rate in K bits/s (default 1200) Valid range = 80 to 4000. YOU CAN ONLY SPECIFY -b OR -s, NOT BOTH! -a bitrate Where bitrate is audio bitrate in K bits/s (default 128) Valid values for layer I: 32,64,96,128,160,192,224,256,288,320,352, 384,416,448 Valid values for layer II: 32,48,56,64,80,96,112,128,160,192,224,256, 320,384 -l layer Where layer specifies which audio layer to use, valid values 1 or 2. (default 2) -j specifies use joint stereo mode IF input file contains stereo audio. Has no effect if audio portion of .avi is mono. (default non-joint stereo) -v specifies fixed datarates as defined for video cd streams. If this option is used, it overides any -a, -b or -s rates specified as well as -l, -n, -c and -y options. -p filename.par specifies video encoding parameter file, (OPTIONAL) allows control over additional parameters. See Param.txt. Note that the parameter file as well as the matrix files must be in the current directory unless you specify full path names. -e specifies encode file even if some frames in avi are bad, ie: use previous good video frame or 0 data for audio if file is corrupt. At least FIRST frame must be valid! -n generate video stream only, ignore audio if there is an audio stream. You must use this option to encode an avi file that does not have an audio track. Result is a .m1v file. (Even if you specify .mpg) -y vbv_buffer size in 16K bit multiples, default = 20 -m motion search magnitude, range 0 - 4, default 0, higher values MAY result in better encoding (depending on video), but will take SIGNIFICANTLY longer to encode. Try it on a short sample first! -c hs vs set output video size to hs horizontal and vs vertical. Larger input video is cropped to fit while smaller video is padded out to size. -f frame_rate_code force mpeg file frame rate regardless of input file frame rate. Implies -n (video only). Frame rates codes -> 1 = 23.976 FPS 2 = 24 FPS 3 = 25 FPS 4 = 29.97 FPS 5 = 30 FPS inputfile.avi A windows avi file constrained to the following parameters: Horizontal size: max 720 pixels Vertical size: max 480 pixels Note: if dimensions are not a multiple of 16, then frame data will be padded out to a multiple of 16 with resulting black bands around picture. Frame rate : 23.976, 24, 25, 29.97, or 30 FPS 10, 12, and 15 FPS are upsampled. Colour depth: 8, 16, 24, or 32 bit. (palletized, thousands, millions, millions+) codec used in file must be installed in windows. Audio sample rate: 11.025, 22.05, and 44.1KHz Audio sample size: 8 or 16 bit Audio channels: 1 or 2 Uncompressed PCM audio only. outputfile.mpg Optional, if not specified, inputfilename with .mpg extension will be created. The optional template.par file contains the same values that the encoder has hard coded as default values for all other video encoding parameters. Use this file as your starting point for experimenting with other values, such as motion search vectors. See param.txt. *** WARNING: VIDEO EXCEEDS CPB STANDARD!, if you get this warning during video encoding, your video exceeds the Constrained Parameter Bitstream standard, and may not be playable on many mpeg-1 players, either software or hardware. Although many players can play mpeg-1 with higher than CPB bitrates, few are capable of higher resolutions than SIF (352x288). Example: avi2mpg1 test This example will encode an .avi file "test.avi" located in the current directory to test.mpg, at 150KB/sec total data rate with audio at 128Kb/sec. You will need to make sure that the current directory has enough room for the temporary files the encoder will produce, in other words, approximately twice the space needed for the resulting .mpg file. Credits: This program is basically the combination of the video encoder by the MPEG Software Simulation Group, available from: "http://www.creative.net/~tristan/MPEG/mssg/mpeg2vidcodec_v12.tar.gz" the ISO audio encoder, available from: "ftp://ftp.iuma.com/audio_utils/converters/source/mpegaudio.tar.Z", and Christoph Moar's systems stream multiplexer, available from: "ftp://ftp.informatik.tu-muenchen.de/pub/comp/graph