This week, I made a computer mouse's encoder module and spent a whole week.This process makes us laugh and cry. We plan to use the CH3 and methane channels of tim3 to collect the PWM of the Left motor for speed measurement and ranging, and use the CH2 and cosine of tim4 to test the right motor.WriteCodeFirst, we did the left motor first. It went to Friday, and we found that the CH3 and 4th channels of the general timer could not be used for PWM input.
1, open the encoder, set the code frame parameters Profile@level, according to the needs of the direct choice of 720p or 1080p, etc. on the line.
2, the following encoding type (Encoding type) is more important. First is single, which is the simplest type of encoding, with the advantage of being fast, but with the same compression rate per frame, which can be wasteful or inadequate.
In general, this is enough, choose Single Pass mode, the followin
Record Cool
The settings in the Encoder window will directly affect the video's quality, sound and bitrate.
Video size: If you want to record HD video, just select "HD Mode", one of the "original quality" is the best, but the resulting file and network code flow will be the largest, "super clear quality" slightly less clarity, but a small half of the file, fluency will also be much higher, you can choose 1/2 size, will be recorded in half the size;
September 14, 2016Author: dengshuai_superSource: http://blog.csdn.net/dengshuai_super/article/details/52541402Disclaimer: Please specify the author and source of the reprint.
BCD encoder (BINARY-BCD Converter) _ Step-shift Method
Gradually left shift, when the BCD0 moved to 11 o'clock equals 3When BCD0 is moved to 111 equals 7>4, plus 3 equals 10, the corresponding binary is 1010;Once again shifted, BCD1 is 1,bcd0 0101 equals 5>4, plus 3 equals 8 cor
uint32_t mediaoptimization::settargetrates (
uint32_t target_bitrate,
uint8_t fraction_lost,
int64_t Round_trip_time_ms,
vcmprotectioncallback* protection_callback) {
criticalsectionscoped lock (crit_sect_. Get ());
...
Estimate the overhead costs of the next second as staying the same
//wrt the source bitrate.
if (sent_total_rate_bps > 0) {
protection_overhead_bps = static_cast
Calculating encoder bandwidth based
java. Security. messagedigest class. The following code snippet shows how to apply the MD5 message digest algorithm (128-bit digest) to a password string:Massagedigest MD =Messagedigest. getinstance ("MD5 ");Md. Update (originalpwd. getbyetes ());Byte [] digestedbytes = md. Digest ();
It also uses the message digest to create a unique ID (also called a digital fingerprint) of the checksum and text ). When the ARJ file is signed, the checksum is calculated based on the content of the ARJ file an
The basic description of speex includes a command line encoder and decoder. these tools generate and read the speex files packaged in the Ogg container. although it can encapsulate speex in any container, Ogg is recommended as a file container. this section describes how to use the command line tool for the speex file of Ogg.
4.1 speexencThe speexenc unit is used to create a speex file through a raw PCM or wave file. You can use the following command:
VoidX1__param_default(X1__param_t * PARAM)
{......
/* Video properties */
Param-> I _csp= X264_csp_i420;
Param-> I _width= 352;
Param-> I _height= 288;
Param-> VUI. I _sar_width = 0;
Param-> VUI. I _sar_height = 0;
Param-> I _fps_num= 25;
Param-> I _fps_den= 1;
Param-> I _level_idc= 40;/* level 4.0 is sufficient for 720x57616 reference frames */
/* Encoder parameters */
Param-> I _frame_reference = 1;//Number of reference frames
Param-> I _keyint_max
close to an envelope. That is to say, the "best preset" is not affected by the video content (of course, there is still a little bit, but the degree is not big ).
This report uses the "bus" test video sequence experiment results.
Summary
This report uses four methods to analyze the x264 option:1. Use convex hull to analyze the optimal option.
2. Use the "color Cloud Chart" to analyze the option. This method is simple and intuitive, but cannot be accurately quantified.
3. Use Lambda paramete
The following method is excerpted from the official help document of Finereport to solve the problem of garbled characters:1 //Description: Chinese file name transcoding2 functionCjkencode (text) {3 if(Text = =NULL) {4 return"";5 }6 varNewText = "";7 for(vari = 0; i ) {8 varCode =text.charcodeat (i);9 if(Code >= | | | code = = | | code = = 93) {TenNewText + = "[" + code.tostring (16) + "]"; One}Else { ANewText + =Text.charat (i); - } - } the
1. encmain. cpp:// Call encoding function ==> encoding function entry !!!Ctappenctop. encode ();
2. tappenctop. cpp:// Call encoding function for one frame each time a YUV is read !!!M_ctenctop.encode (BEOs, flush? 0: pcpicyuvorg, m_clistpicyuvrec, outputaccessunits, inumencoded );
3. tenctop. cpp:// Compress GOP frame encoding function !!!M_cgopencoder.compressgop (m_ipoclast, m_inumpicrcvd, m_clistpic, rclistpicyuvrecout, accessunitsout );
4. tengop: CPP:// Encode the Code with the best
Refer to the following article:http://blog.csdn.net/a992036795/article/details/54286654First, prefaceAs I said in the previous article, I used libx264 to encode video h264 very inefficiently, because libx264 uses soft coding. So I searched online to learn that using the system API can hard code video, thereby reducing the pressure on the CPU, to improve the efficiency of the role. I wrote a demo and tried it, and it was obvious that efficiency was improved.second, the idea1. Core class
Med
uint32_t mediaoptimization::settargetrates (
uint32_t target_bitrate,
uint8_t fraction_lost,
int64_t Round_trip_time_ms,
vcmprotectioncallback* protection_callback) {
criticalsectionscoped lock (crit_sect_. Get ());
...
Estimate the overhead costs of the next second as staying the same
//wrt the source bitrate.
if (sent_total_rate_bps > 0) {
protection_overhead_bps = static_cast
Calculating encoder bandwidth based
= "$LD _library_path:/usr/local/ffmpeg/lib/"
souce/etc/profile
4. Download opencv2.4.13, after decompression into the directory, the author is using opencv-2.4.13, execute the following command
CD ~/opencv-2.4.13/
mkdir build
CD
The following make command because the author installs the Cuda, therefore inside uses cuda_generation=auto this compilation option, does not use Cuda compiles the child shoe to be possible to delete this piece configuration to compile.
cmake-d cmake_build_type=release
To achieve network playback, find the protocol and find the open source file. Finally find a usable
I was shocked when the broadcast came! This is too easy. The steps are as follows:
1, download live555, URL: http://www.live555.com/liveMedia/
2
Before we begin to discuss coding decoding, let's be clear about the problem.
What is a application/x-www-form-urlencoded string.
A: It is a type of encoding. These characters are converted to application/x-www-form-urlencoded strings when the URL
Use the library in live555 to write a simple rtspserver program for learning purposes only. The Code in the following example shows the function call process of the rtspserver.
# Include # include "livemedia. HH "static servermediasession *
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