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MediaSPIP Simple : futur thème graphique par défaut ?
26 septembre 2013, par
Mis à jour : Octobre 2013
Langue : français
Type : Video
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GetID3 - Bloc informations de fichiers
9 avril 2013, par
Mis à jour : Mai 2013
Langue : français
Type : Image
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GetID3 - Boutons supplémentaires
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Mis à jour : Avril 2013
Langue : français
Type : Image
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Sur d’autres sites (10279)
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Linker error by trying example program with ffmpeg
11 mars, par ChrisI think this might be a stupid question and I'm just blind but that thing is driving me nuts for hours now.
I downloaded ffmpeg and build it. Now I want to try the thing out in a program but I can't setup cmake to link ffmpeg properly and have no idea what is wrong.


The linker always tells me this :


christoph@christoph-ThinkPad-T490:~/develop/ffmpg_example/build$ make
[ 50%] Linking CXX executable test
CMakeFiles/test.dir/main.cxx.o: In function `main':
main.cxx:(.text+0x180): undefined reference to `av_register_all()'
main.cxx:(.text+0x1a7): undefined reference to `avformat_open_input(AVFormatContext**, char const*, AVInputFormat*, AVDictionary**)'
main.cxx:(.text+0x1ce): undefined reference to `avformat_find_stream_info(AVFormatContext*, AVDictionary**)'
main.cxx:(.text+0x206): undefined reference to `av_dump_format(AVFormatContext*, int, char const*, int)'
main.cxx:(.text+0x2bb): undefined reference to `avcodec_find_decoder(AVCodecID)'
main.cxx:(.text+0x2fc): undefined reference to `avcodec_alloc_context3(AVCodec const*)'
main.cxx:(.text+0x316): undefined reference to `avcodec_copy_context(AVCodecContext*, AVCodecContext const*)'
main.cxx:(.text+0x361): undefined reference to `avcodec_open2(AVCodecContext*, AVCodec const*, AVDictionary**)'
main.cxx:(.text+0x377): undefined reference to `av_frame_alloc()'
main.cxx:(.text+0x383): undefined reference to `av_frame_alloc()'
main.cxx:(.text+0x3ba): undefined reference to `avpicture_get_size(AVPixelFormat, int, int)'
main.cxx:(.text+0x3d0): undefined reference to `av_malloc(unsigned long)'
main.cxx:(.text+0x3ff): undefined reference to `avpicture_fill(AVPicture*, unsigned char const*, AVPixelFormat, int, int)'
main.cxx:(.text+0x43d): undefined reference to `sws_getContext(int, int, AVPixelFormat, int, int, AVPixelFormat, int, SwsFilter*, SwsFilter*, double const*)'
main.cxx:(.text+0x465): undefined reference to `av_read_frame(AVFormatContext*, AVPacket*)'
main.cxx:(.text+0x49f): undefined reference to `avcodec_decode_video2(AVCodecContext*, AVFrame*, int*, AVPacket const*)'
main.cxx:(.text+0x4fd): undefined reference to `sws_scale(SwsContext*, unsigned char const* const*, int const*, int, int, unsigned char* const*, int const*)'
main.cxx:(.text+0x545): undefined reference to `av_free_packet(AVPacket*)'
main.cxx:(.text+0x556): undefined reference to `av_free(void*)'
main.cxx:(.text+0x565): undefined reference to `av_frame_free(AVFrame**)'
main.cxx:(.text+0x574): undefined reference to `av_frame_free(AVFrame**)'
main.cxx:(.text+0x580): undefined reference to `avcodec_close(AVCodecContext*)'
main.cxx:(.text+0x58f): undefined reference to `avcodec_close(AVCodecContext*)'
main.cxx:(.text+0x59e): undefined reference to `avformat_close_input(AVFormatContext**)'
collect2: error: ld returned 1 exit status
CMakeFiles/test.dir/build.make:87: recipe for target 'test' failed
make[2]: *** [test] Error 1
CMakeFiles/Makefile2:75: recipe for target 'CMakeFiles/test.dir/all' failed
make[1]: *** [CMakeFiles/test.dir/all] Error 2
Makefile:83: recipe for target 'all' failed
make: *** [all] Error 2


The cmake list looks like this :


cmake_minimum_required(VERSION 3.16)

project(ffmpeg_test)

add_library(avformat STATIC IMPORTED)
set_target_properties(avformat
 PROPERTIES IMPORTED_LOCATION /home/christoph/develop/FFmpeg/build/lib/libavformat.a
)
add_library(avcodec STATIC IMPORTED)
set_target_properties(avcodec
 PROPERTIES IMPORTED_LOCATION /home/christoph/develop/FFmpeg/build/lib/libavcodec.a
)
add_library(swscale STATIC IMPORTED)
set_target_properties(swscale
 PROPERTIES IMPORTED_LOCATION /home/christoph/develop/FFmpeg/build/lib/libswscale.a
)
add_library(avutil STATIC IMPORTED)
set_target_properties(avutil
 PROPERTIES IMPORTED_LOCATION /home/christoph/develop/FFmpeg/build/lib/libavutil.a
)
add_executable(test main.cxx)

target_link_libraries(test PRIVATE
 /home/christoph/develop/FFmpeg/build/lib/libavformat.a
 avcodec
 swscale
 avutil
)
target_include_directories(test PRIVATE /home/christoph/develop/FFmpeg/build/include)


And here are the ffmpeg libs :


christoph@christoph-ThinkPad-T490:~/develop/FFmpeg/build/lib$ ll
total 277840
drwxr-xr-x 3 christoph christoph 4096 Dez 7 23:59 ./
drwxr-xr-x 17 christoph christoph 4096 Dez 7 23:59 ../
-rw-r--r-- 1 christoph christoph 173479270 Dez 7 23:59 libavcodec.a
-rw-r--r-- 1 christoph christoph 2174910 Dez 7 23:59 libavdevice.a
-rw-r--r-- 1 christoph christoph 37992438 Dez 7 23:59 libavfilter.a
-rw-r--r-- 1 christoph christoph 59222040 Dez 7 23:59 libavformat.a
-rw-r--r-- 1 christoph christoph 4759514 Dez 7 23:59 libavutil.a
-rw-r--r-- 1 christoph christoph 695698 Dez 7 23:59 libswresample.a
-rw-r--r-- 1 christoph christoph 6164398 Dez 7 23:59 libswscale.a
drwxr-xr-x 2 christoph christoph 4096 Dez 7 23:59 pkgconfig/


And this is the example code :


#include

#include <libavcodec></libavcodec>avcodec.h>
#include <libavformat></libavformat>avformat.h>
#include <libswscale></libswscale>swscale.h>

// compatibility with newer API
#if LIBAVCODEC_VERSION_INT < AV_VERSION_INT(55,28,1)
#define av_frame_alloc avcodec_alloc_frame
#define av_frame_free avcodec_free_frame
#endif

void SaveFrame(AVFrame *pFrame, int width, int height, int iFrame) {
 FILE *pFile;
 char szFilename[32];
 int y;
 
 // Open file
 sprintf(szFilename, "frame%d.ppm", iFrame);
 pFile=fopen(szFilename, "wb");
 if(pFile==NULL)
 return;
 
 // Write header
 fprintf(pFile, "P6\n%d %d\n255\n", width, height);
 
 // Write pixel data
 for(y=0; ydata[0]+y*pFrame->linesize[0], 1, width*3, pFile);
 
 // Close file
 fclose(pFile);
}

int main(int argc, char *argv[]) {
 // Initalizing these to NULL prevents segfaults!
 AVFormatContext *pFormatCtx = NULL;
 int i, videoStream;
 AVCodecContext *pCodecCtxOrig = NULL;
 AVCodecContext *pCodecCtx = NULL;
 AVCodec *pCodec = NULL;
 AVFrame *pFrame = NULL;
 AVFrame *pFrameRGB = NULL;
 AVPacket packet;
 int frameFinished;
 int numBytes;
 uint8_t *buffer = NULL;
 struct SwsContext *sws_ctx = NULL;

 if(argc < 2) {
 printf("Please provide a movie file\n");
 return -1;
 }
 // Register all formats and codecs
 av_register_all();
 
 // Open video file
 if(avformat_open_input(&pFormatCtx, argv[1], NULL, NULL)!=0)
 return -1; // Couldn't open file
 
 // Retrieve stream information
 if(avformat_find_stream_info(pFormatCtx, NULL)<0)
 return -1; // Couldn't find stream information
 
 // Dump information about file onto standard error
 av_dump_format(pFormatCtx, 0, argv[1], 0);
 
 // Find the first video stream
 videoStream=-1;
 for(i=0; inb_streams; i++)
 if(pFormatCtx->streams[i]->codec->codec_type==AVMEDIA_TYPE_VIDEO) {
 videoStream=i;
 break;
 }
 if(videoStream==-1)
 return -1; // Didn't find a video stream
 
 // Get a pointer to the codec context for the video stream
 pCodecCtxOrig=pFormatCtx->streams[videoStream]->codec;
 // Find the decoder for the video stream
 pCodec=avcodec_find_decoder(pCodecCtxOrig->codec_id);
 if(pCodec==NULL) {
 fprintf(stderr, "Unsupported codec!\n");
 return -1; // Codec not found
 }
 // Copy context
 pCodecCtx = avcodec_alloc_context3(pCodec);
 if(avcodec_copy_context(pCodecCtx, pCodecCtxOrig) != 0) {
 fprintf(stderr, "Couldn't copy codec context");
 return -1; // Error copying codec context
 }

 // Open codec
 if(avcodec_open2(pCodecCtx, pCodec, NULL)<0)
 return -1; // Could not open codec
 
 // Allocate video frame
 pFrame=av_frame_alloc();
 
 // Allocate an AVFrame structure
 pFrameRGB=av_frame_alloc();
 if(pFrameRGB==NULL)
 return -1;

 // Determine required buffer size and allocate buffer
 numBytes=avpicture_get_size(AV_PIX_FMT_RGB24, pCodecCtx->width,
 pCodecCtx->height);
 buffer=(uint8_t *)av_malloc(numBytes*sizeof(uint8_t));
 
 // Assign appropriate parts of buffer to image planes in pFrameRGB
 // Note that pFrameRGB is an AVFrame, but AVFrame is a superset
 // of AVPicture
 avpicture_fill((AVPicture *)pFrameRGB, buffer, AV_PIX_FMT_RGB24,
 pCodecCtx->width, pCodecCtx->height);
 
 // initialize SWS context for software scaling
 sws_ctx = sws_getContext(pCodecCtx->width,
 pCodecCtx->height,
 pCodecCtx->pix_fmt,
 pCodecCtx->width,
 pCodecCtx->height,
 AV_PIX_FMT_RGB24,
 SWS_BILINEAR,
 NULL,
 NULL,
 NULL
 );

 // Read frames and save first five frames to disk
 i=0;
 while(av_read_frame(pFormatCtx, &packet)>=0) {
 // Is this a packet from the video stream?
 if(packet.stream_index==videoStream) {
 // Decode video frame
 avcodec_decode_video2(pCodecCtx, pFrame, &frameFinished, &packet);
 
 // Did we get a video frame?
 if(frameFinished) {
 // Convert the image from its native format to RGB
 sws_scale(sws_ctx, (uint8_t const * const *)pFrame->data,
 pFrame->linesize, 0, pCodecCtx->height,
 pFrameRGB->data, pFrameRGB->linesize);
 
 // Save the frame to disk
 if(++i<=5)
 SaveFrame(pFrameRGB, pCodecCtx->width, pCodecCtx->height, 
 i);
 }
 }
 
 // Free the packet that was allocated by av_read_frame
 av_free_packet(&packet);
 }
 
 // Free the RGB image
 av_free(buffer);
 av_frame_free(&pFrameRGB);
 
 // Free the YUV frame
 av_frame_free(&pFrame);
 
 // Close the codecs
 avcodec_close(pCodecCtx);
 avcodec_close(pCodecCtxOrig);

 // Close the video file
 avformat_close_input(&pFormatCtx);
 
 return 0;
}


-
How to increase conversions to meet your business goals
8 septembre 2020, par Joselyn Khor — Analytics Tips, MarketingThrough optimizing your messaging, content, or your page layouts, you can increase conversions by getting your visitors through a clear pathway to achieve your business goals.
Conversion Rate Optimization
When we talk about optimizing websites to improve and increase conversions, we’re really talking about conversion rate optimization (CRO).
CRO is the process of learning what the most valuable content/aspect of your website is and how to best optimize this for your visitors to increase its chance to convert. It typically involves generating ideas for elements on your site or app that can be improved, learning which pathways visitors are most likely going to take to conversion and then validating those assumptions through A/B testing and multivariate testing to transform learning into actionable insights.
Conversion Rate
The conversion rate is expressed as a % and the goal for any business should be to increase the % of conversions for any given goal e.g. in February a website had 200 newsletter sign-ups from 1,000 visitors on its sign-up page, a conversion rate of 20%. CRO should be used to increase the sign-up rate from 20% to 25%, and then eventually from 25% to 30% and so on.
CRO cheat sheet
You need to consider your website or business’ objectives (bigger picture) as well as your website goals (smaller achievements). Whatever the aim of your website, it’s crucial for this to be your starting point. Figure out what you want your website to do and what you want visitors to get from it. When you do that, you’ll know what conversions to focus on.- Define your business/website’s objectives. Do you want the website to drive sales ? Is the website a hub to raise awareness for a charity ? Do you want to increase readership for your news site ?
- Define what your conversion goals are. This helps you narrow your focus so you follow a path to meet your overall objectives. By defining these, you clarify for yourself the next actions you should take, such as wanting to funnel users through to a sign up landing page. Then you’ll need to optimize and test your sign up landing page. If conversions are low, then tweak it and measure the results until you find you’ve increased conversion rates.
- Conversion goals can include :
- Purchases in your ecommerce store
- eBook downloads
- Sign ups to your mailing list
- Visitors successfully filling in a contact form
- Figure out what your Key Performance Indicators (KPIs) are and the metrics you need to focus on to achieve them.
How to increase conversions with Matomo
1. Set goals
“Make Sure Goals Are Clearly Understood. To prove the value of an analytics-focused company, any project you take on needs to have clear goals. If you don’t have a goal in mind you’ll fail. Everyone involved in the project needs to be aligned around the goals.”
A goal is the measure of a successful action that you want your visitors to take. The more goals you track, the more you can learn about behavioural changes as you implement and modify paths that lead to conversions over time.
You’ll understand which channels and campaigns (SEO, PPC, newsletter, blogging etc.) are converting the best for your business, which cities/countries are most popular, what devices are working and how engaged your visitors are before converting. Learn more
2. Set Heatmaps
This is vital to show how your visitors are engaging with your website, blog pages, signup and sales pages. If you want to learn how your visitors really engage with your website to increase conversions, Heatmaps lets you see the results visually without any guesswork.
By showing where your visitors try to click, move the mouse or how far down they’re scrolling on each page, you can effortlessly discover how your visitors truly engage with your most important web pages. Rather than guessing, rely on facts to prove if the changes you make actually improve your website or not. Learn more
How to improve conversion rates with Heatmaps :
- If you’ve got important information that will sell your service/product or bring you loyal followers, make sure it’s in the hot zones as shown in your heatmaps.
- Try to rearrange parts of your pages to see if that increases engagement.
- Make it easy for people to take important actions by having the CTA above-the-fold where 100% of visitors see it. Make sure you don’t clutter this section with too many messages or actions.
- You can also identify areas to add links as heatmaps shows where people want to click.
- Find what content is most popular on the page
3. Session Recordings
This is a conversion research technique where you learn what your users are trying to do and make sure your website is optimized to give them what they want. With Session Recordings you can playback all the interactions your visitors took on your website, such as clicks, mouse movements, scrolls, resizes, form interactions and page changes in a video. Truly understand how real visitors are using your website and what experiences they’re having.
Also, by understanding what’s working you’re increasing the usability of your website, Session Recordings allow you to identify problem areas as well as where users are getting stuck. Learn more
How to improve conversion rates with Session Recordings : For example, on a product landing page, you see your visitor highlighting specific words and putting it into search. With this you can observe what they’re trying to find and what they’re actually interested in. As you tweak the page to ensure what the visitor wants can be easily found, you’re taking steps to increase the chance for more conversions.
4. A/B Testing
Test anything and test anywhere to increase your conversions. Grow your website by comparing different versions of your landing pages to determine what works best for your users. Subtle tweaks across different versions of your landing pages can have a significant impact on converting incoming traffic.
The changes for each landing page could be :
- A different headline
- Less copy vs more copy
- Different calls-to-action
- Colour schemes, forms, fonts, links, testimonials,
- Or, it could be an entirely different page layout altogether.
The idea is to see if either page A or page B (or C or D) was most successful in getting your visitors to the next step in the conversion funnel. Learn more
How Matomo used A/B Testing : For our sign up page we tested three different CTAs and found how phrasing words differently could help improve conversion rates. Both “Start improving your websites” and “Start converting more users now” were stronger CTAs and converted 7% more than, “Start my free 30-day trial”.
5. Form Analytics
Form Analytics gives you powerful insights into how your visitors interact with your forms (like cart, sign-up and checkout forms).
Online forms can come in thousands of different variations. It’s an area on your website that if not done right, could lead to you missing out on converting a large portion of your visitors. Rely on facts when you change your forms. Learn more
How to improve conversion rates with Form Analytics : By proving whether your form is doing better when you change it and by how much. This lets you consistently increase form submission rates (conversions) on your website which is crucial to the success of your business.
6. Funnels
At a glance you will learn the steps (actions, events and pages) your users go through to the desired outcomes you want them to achieve whether it’s a sale, sign-up or any other particular goal you have defined.
Looking at the entire conversion funnel and focusing on usability, you’ll be able to identify where your visitors are having problems, where they aren’t understanding the flow of your webpages and identify obstacles that get in the way of your users reaching that end goal. Learn more
How to improve conversion rates with Funnels : Learn what makes your visitors take action (or what stops them) in progressing to the next step in the conversion funnel. At each step, you’ll discover what content/layout resonates with your visitors and you can optimize your website to have the greatest impact on your business.
7. Behaviour
This is one of the most important features to help you optimize your website for conversions. Learning visitor behaviour is a driving force to increase conversions. How ? It lets you identify where you could be taking action to increase conversions. You get to learn first-hand what content or feature on your site is or isn’t working for your visitors.
Engagement is essential to help increase conversion rates. If your visitors aren’t interested in the content on your site, then there’s very little chance they’ll be interested in what you have to offer. Learn more
How to improve conversion rates with Behaviour : Get started by reducing bounce rates on important pages, testing messaging on your most popular entry pages, testing on the highest exit pages to reduce visitors leaving the site, learning pathways through Users Flow and Transitions to see if users are taking pathways that lead them to conversions or are the journeys currently long or go in odd directions. Discover how your visitors are responding to your content. The happier your visitors are to stay on your site, the more likely they’ll be able to move through the journey to help you achieve the goals you’ve set for your site.
Do privacy-focused industries need conversion optimization ?
For industries that place extra emphasis on privacy and security, Matomo is a complete analytics tool that can cater for all your needs. You get the full benefits of a web analytics and conversion optimization platform as well as peace of mind knowing Matomo places emphasis on security/privacy and adheres strictly to GDPR.
If you operate in a data sensitive industry like in government, healthcare, finance, education etc. you can rest assured knowing your user’s privacy is respected and that you will have 100% data ownership.
Other conversion optimization metrics in Matomo to look at :
Get a good indication that your conversion optimization efforts are working by knowing where to look and this starts by going through the metrics in your analytics. Below we list how you can make a start.
“Best” metrics are hard to determine so you’ll need to ask yourself what you want your site to do. How do you want your users to behave or what kind of customer journey do you want them to have ?
You can start with :
- Decreasing abandonment rate
- Decreasing bounce rate
- Increasing interactions per visit
- Reducing exit rates on pages that significantly impact your visitors to leave your site
- Constantly test and learn what content resonates with your visitors
- Look to advance more users through each stage of the conversion funnel
- Improve your forms to increase submission rates
- Always improve the conversion rate % for your goals e.g. if you currently have a 5% conversion rate for selling a product, aim for 10% ; if 30% of your visitors are downloading your e-book, then aim for 40%, then 50% and so on.
Through optimizing your messaging, content or your page layouts, you will increase conversions by getting your visitors through a clear pathway to meet your website’s goal.
-
C++ ffmpeg and SDL2 video rendering memory leak
10 avril 2017, par kj192I have made a small program what plays a video in SDL2.0 and FFmpeg.
The software does work and do it is purpose.
I have left the software running and I have faced a huge memory consumption and started to look online what can I do against it.
I have used the following tutorials :
http://www.developersite.org/906-59411-FFMPEG
http://ardrone-ailab-u-tokyo.blogspot.co.uk/2012/07/212-ardrone-20-video-decording-ffmpeg.htmlI wonder if someone can give advice what do I do wrong. I have tried valgrind but I can’t find any information. I have did try to comment out sections and what I have seen even if I’m not rendering to the display the memory usage is growing and after delete something still not been freed up :
if (av_read_frame(pFormatCtx, &packet) >= 0)the whole source code is here :
main :#include
#include <ios>
#include <iostream>
#include <fstream>
#include
#include <sdl2></sdl2>SDL.h>
#include "video.h"
using namespace std;
void memory()
{
using std::ios_base;
using std::ifstream;
using std::string;
double vm_usage = 0.0;
double resident_set = 0.0;
// 'file' stat seems to give the most reliable results
//
ifstream stat_stream("/proc/self/stat",ios_base::in);
// dummy vars for leading entries in stat that we don't care about
//
string pid, comm, state, ppid, pgrp, session, tty_nr;
string tpgid, flags, minflt, cminflt, majflt, cmajflt;
string utime, stime, cutime, cstime, priority, nice;
string O, itrealvalue, starttime;
// the two fields we want
//
unsigned long vsize;
long rss;
stat_stream >> pid >> comm >> state >> ppid >> pgrp >> session >> tty_nr
>> tpgid >> flags >> minflt >> cminflt >> majflt >> cmajflt
>> utime >> stime >> cutime >> cstime >> priority >> nice
>> O >> itrealvalue >> starttime >> vsize >> rss; // don't care about the rest
stat_stream.close();
long page_size_kb = sysconf(_SC_PAGE_SIZE) / 1024; // in case x86-64 is configured to use 2MB pages
vm_usage = vsize / 1024.0;
resident_set = rss * page_size_kb;
std::cout<<"VM: " << vm_usage << " RE:"<< resident_set << std::endl;
}
int main()
{
//This example using 1280x800 video
av_register_all();
if( SDL_Init(SDL_INIT_VIDEO | SDL_INIT_AUDIO | SDL_INIT_TIMER ))
{
fprintf(stderr, "Could not initialize SDL - %s\n", SDL_GetError());
exit(1);
}
SDL_Window* sdlWindow = SDL_CreateWindow("Video Window", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, 1280, 800, SDL_WINDOW_OPENGL);
if( !sdlWindow )
{
fprintf(stderr, "SDL: could not set video mode - exiting\n");
exit(1);
}
SDL_Renderer* sdlRenderer = SDL_CreateRenderer(sdlWindow, -1, SDL_RENDERER_ACCELERATED | SDL_RENDERER_PRESENTVSYNC | SDL_RENDERER_TARGETTEXTURE);
SDL_Texture* sdlTexture = SDL_CreateTexture(sdlRenderer, SDL_PIXELFORMAT_YV12, SDL_TEXTUREACCESS_STREAMING, 1280, 800);
if(!sdlTexture)
{
return -1;
}
SDL_SetTextureBlendMode(sdlTexture,SDL_BLENDMODE_BLEND );
//VIDEO RESOLUTION
SDL_Rect sdlRect;
sdlRect.x = 0;
sdlRect.y = 0;
sdlRect.w = 1280;
sdlRect.h = 800;
memory();
for(int i = 1; i < 6; i++)
{
memory();
video* vid = new video("vid.mp4");
while (!vid -> getFinished())
{
memory();
vid -> Update(sdlTexture);
SDL_RenderCopy(sdlRenderer,sdlTexture,&sdlRect,&sdlRect);
SDL_RenderPresent(sdlRenderer);
}
delete vid;
memory();
}
SDL_DestroyTexture(sdlTexture);
SDL_DestroyRenderer(sdlRenderer);
SDL_DestroyWindow(sdlWindow);
SDL_Quit();
return 0;
}
</fstream></iostream></ios>video.cpp
#include "video.h"
video::video(const std::string& name) : _finished(false)
{
av_register_all();
pFormatCtx = NULL;
pCodecCtxOrig = NULL;
pCodecCtx = NULL;
pCodec = NULL;
pFrame = NULL;
sws_ctx = NULL;
if (avformat_open_input(&pFormatCtx, name.c_str(), NULL, NULL) != 0)
{
_finished = true; // Couldn't open file
}
// Retrieve stream information
if (avformat_find_stream_info(pFormatCtx, NULL) < 0)
{
_finished = true; // Couldn't find stream information
}
videoStream = -1;
for (i = 0; i < pFormatCtx->nb_streams; i++)
{
if (pFormatCtx->streams[i]->codec->codec_type == AVMEDIA_TYPE_VIDEO)
{
videoStream = i;
break;
}
}
if (videoStream == -1)
{
_finished = true; // Didn't find a video stream
}
// Get a pointer to the codec context for the video stream
pCodecCtxOrig = pFormatCtx->streams[videoStream]->codec;
// Find the decoder for the video stream
pCodec = avcodec_find_decoder(pCodecCtxOrig->codec_id);
if (pCodec == NULL)
{
fprintf(stderr, "Unsupported codec!\n");
_finished = true; // Codec not found
}
pCodecCtx = avcodec_alloc_context3(pCodec);
if (avcodec_copy_context(pCodecCtx, pCodecCtxOrig) != 0)
{
fprintf(stderr, "Couldn't copy codec context");
_finished = true; // Error copying codec context
}
// Open codec
if (avcodec_open2(pCodecCtx, pCodec, NULL) < 0)
{
_finished = true; // Could not open codec
}
// Allocate video frame
pFrame = av_frame_alloc();
sws_ctx = sws_getContext(pCodecCtx->width, pCodecCtx->height,
pCodecCtx->pix_fmt, pCodecCtx->width, pCodecCtx->height,
AV_PIX_FMT_YUV420P,
SWS_BILINEAR,
NULL,
NULL,
NULL);
yPlaneSz = pCodecCtx->width * pCodecCtx->height;
uvPlaneSz = pCodecCtx->width * pCodecCtx->height / 4;
yPlane = (Uint8*)malloc(yPlaneSz);
uPlane = (Uint8*)malloc(uvPlaneSz);
vPlane = (Uint8*)malloc(uvPlaneSz);
if (!yPlane || !uPlane || !vPlane)
{
fprintf(stderr, "Could not allocate pixel buffers - exiting\n");
exit(1);
}
uvPitch = pCodecCtx->width / 2;
}
void video::Update(SDL_Texture* texture)
{
if (av_read_frame(pFormatCtx, &packet) >= 0)
{
// Is this a packet from the video stream?
if (packet.stream_index == videoStream)
{
avcodec_decode_video2(pCodecCtx, pFrame, &frameFinished, &packet);
// Did we get a video frame?
if (frameFinished)
{
AVPicture pict;
pict.data[0] = yPlane;
pict.data[1] = uPlane;
pict.data[2] = vPlane;
pict.linesize[0] = pCodecCtx->width;
pict.linesize[1] = uvPitch;
pict.linesize[2] = uvPitch;
// Convert the image into YUV format that SDL uses
sws_scale(sws_ctx, (uint8_t const * const *) pFrame->data,pFrame->linesize, 0, pCodecCtx->height, pict.data,pict.linesize);
SDL_UpdateYUVTexture(texture,NULL,yPlane,pCodecCtx->width,uPlane,uvPitch,vPlane,uvPitch);
}
}
// Free the packet that was allocated by av_read_frame
av_packet_unref(&packet);
av_freep(&packet);
}
else
{
av_packet_unref(&packet);
av_freep(&packet);
_finished = true;
}
}
bool video::getFinished()
{
return _finished;
}
video::~video()
{
av_packet_unref(&packet);
av_freep(&packet);
av_frame_free(&pFrame);
av_freep(&pFrame);
free(yPlane);
free(uPlane);
free(vPlane);
// Close the codec
avcodec_close(pCodecCtx);
avcodec_close(pCodecCtxOrig);
sws_freeContext(sws_ctx);
// Close the video file
for (int i = 0; i < pFormatCtx->nb_streams; i++)
{
AVStream *stream = pFormatCtx->streams[i];
avcodec_close(stream->codec);
}
avformat_close_input(&pFormatCtx);
/*av_dict_free(&optionsDict);
sws_freeContext(sws_ctx);
av_free_packet(&packet);
av_free(pFrameYUV);
av_free(buffer);
avcodec_close(pCodecCtx);
avformat_close_input(&pFormatCtx);*/
}video.h
#include <string>
#include <sdl2></sdl2>SDL.h>
#ifdef __cplusplus
extern "C" {
#endif
#include <libavcodec></libavcodec>avcodec.h>
#include <libavformat></libavformat>avformat.h>
#include <libswscale></libswscale>swscale.h>
#ifdef __cplusplus
}
#endif
class video
{
private:
bool _finished;
AVFormatContext *pFormatCtx;
int videoStream;
unsigned i;
AVCodecContext *pCodecCtxOrig;
AVCodecContext *pCodecCtx;
AVCodec *pCodec;
AVFrame *pFrame;
AVPacket packet;
int frameFinished;
struct SwsContext *sws_ctx;
Uint8 *yPlane, *uPlane, *vPlane;
size_t yPlaneSz, uvPlaneSz;
int uvPitch;
public:
video(const std::string& name);
~video();
void Update(SDL_Texture* texture);
bool getFinished();
};
</string>I’m looking forward to your answers
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