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Autres articles (83)
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Gestion générale des documents
13 mai 2011, parMédiaSPIP ne modifie jamais le document original mis en ligne.
Pour chaque document mis en ligne il effectue deux opérations successives : la création d’une version supplémentaire qui peut être facilement consultée en ligne tout en laissant l’original téléchargeable dans le cas où le document original ne peut être lu dans un navigateur Internet ; la récupération des métadonnées du document original pour illustrer textuellement le fichier ;
Les tableaux ci-dessous expliquent ce que peut faire MédiaSPIP (...) -
Organiser par catégorie
17 mai 2013, parDans MédiaSPIP, une rubrique a 2 noms : catégorie et rubrique.
Les différents documents stockés dans MédiaSPIP peuvent être rangés dans différentes catégories. On peut créer une catégorie en cliquant sur "publier une catégorie" dans le menu publier en haut à droite ( après authentification ). Une catégorie peut être rangée dans une autre catégorie aussi ce qui fait qu’on peut construire une arborescence de catégories.
Lors de la publication prochaine d’un document, la nouvelle catégorie créée sera proposée (...) -
Récupération d’informations sur le site maître à l’installation d’une instance
26 novembre 2010, parUtilité
Sur le site principal, une instance de mutualisation est définie par plusieurs choses : Les données dans la table spip_mutus ; Son logo ; Son auteur principal (id_admin dans la table spip_mutus correspondant à un id_auteur de la table spip_auteurs)qui sera le seul à pouvoir créer définitivement l’instance de mutualisation ;
Il peut donc être tout à fait judicieux de vouloir récupérer certaines de ces informations afin de compléter l’installation d’une instance pour, par exemple : récupérer le (...)
Sur d’autres sites (3124)
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(C_UDP Socket Programming) How can I convert binary file to video format ?
30 avril 2024, par user24723398I am practicing UDP socket programming. My code's functions are below.


- 

- Connect Server-Client and send "hello" message each other (it is working).
- Then Server is sending video file to client (problem).






Transfer video file to client is working. But it is written in binary so I can't open the video.


So I try to use ffmpeg to convert the video, but it doesn't work.


Is there something wrong in my code ? How can I transfer a received file to a video file ?


My environment is MacOs.


Server.c (Server Code) :


#include 
#include 
#include 
#include <arpa></arpa>inet.h>
#include 
#include <sys></sys>socket.h>

#define PORT 8888
#define BUF_SIZE 256

int main(){
 int serv_sock;
 char message[BUF_SIZE];
 char buf[BUF_SIZE];
 int str_len;
 socklen_t clnt_adr_sz;

 struct sockaddr_in serv_adr, clnt_adr;
 
 //create socket
 serv_sock=socket(PF_INET, SOCK_DGRAM, 0);
 if(serv_sock == -1){
 perror("socket() error");
 exit(1);
 }
 
 //socket address
 memset(&serv_adr, 0, sizeof(serv_adr));
 serv_adr.sin_family=AF_INET;
 serv_adr.sin_addr.s_addr=htonl(INADDR_ANY);
 serv_adr.sin_port=htons(PORT);
 //binding socket
 if(bind(serv_sock, (struct sockaddr*)&serv_adr, sizeof(serv_adr)) == -1){
 perror("bind() error");
 exit(1);
 }
 
 while(1){
 clnt_adr_sz=sizeof(clnt_adr);
 str_len=recvfrom(serv_sock, message, BUF_SIZE, 0, (struct sockaddr *)&clnt_adr, &clnt_adr_sz);
 if (str_len < 0) {
 perror("recvfrom error");
 exit(1);
 }
 
 char hello_message[] = "hello i am server";
 if (sendto(serv_sock, hello_message, strlen(hello_message), 0, (struct sockaddr *)&clnt_adr, clnt_adr_sz) < 0) {
 perror("sendto error");
 exit(1);
 }
 
 //print message
 message[str_len] = '\0';
 printf("client say: %s\n", message);
 
 char buf[BUF_SIZE];
 ssize_t bytes_read;
 // sending viedo file
 printf("sending video file...\n");
 size_t fsize;
 
 //video file
 FILE *file;
 char *filename = "video.mp4";
 // open video file
 file = fopen(filename, "rb");
 if (file == NULL) {
 perror("File opening failed");
 exit(EXIT_FAILURE);
 }
 //calculate video file memory
 fseek(file, 0, SEEK_END);
 fsize = ftell(file);
 fseek(file,0,SEEK_SET);
 
 size_t size = htonl(fsize);
 int nsize =0;
 
 while(nsize!=fsize){
 int fpsize = fread(buf,1, BUF_SIZE, file);
 nsize += fpsize;
 if (sendto(serv_sock, &size, sizeof(size), 0, (struct sockaddr *)&clnt_adr, clnt_adr_sz) < 0) {
 perror("sendto");
 exit(EXIT_FAILURE); 
 }
 fclose(file);
 /*
 while ((bytes_read = fread(buf, 1, BUF_SIZE, file)) > 0) {
 if (sendto(serv_sock, buf, bytes_read, 0,
 (struct sockaddr *)&clnt_adr, clnt_adr_sz) < 0) {
 perror("sendto");
 exit(EXIT_FAILURE);
 } 
 }
 */
 } 
 }
 close(serv_sock);
 return 0;
}


Client.c (Client code)


#include 
#include 
#include 
#include <arpa></arpa>inet.h>
#include 
#include <sys></sys>socket.h>

#define BUFSIZE 256
#define PORT 8888

int main(){
 int sock;
 char message[BUFSIZE];
 int str_len;
 socklen_t adr_sz;

 struct sockaddr_in serv_addr, client_addr; 
 
 sock = socket(PF_INET, SOCK_DGRAM, 0);
 if(sock == -1){
 printf("socket() error\n");
 exit(1);
 }

 memset(&serv_addr, 0, sizeof(serv_addr));
 serv_addr.sin_family = AF_INET;
 serv_addr.sin_addr.s_addr = inet_addr("127.0.0.1");
 serv_addr.sin_port = htons(PORT);

 char hello_message[] = "hello i am client";
 sendto(sock, hello_message, strlen(hello_message), 0, (struct sockaddr*)&serv_addr, sizeof(serv_addr));
 adr_sz = sizeof(client_addr);
 str_len=recvfrom(sock,message,BUFSIZE,0,(struct sockaddr*)&client_addr,&adr_sz);
 
 message[str_len] = '\0';
 printf("client say: %s\n", message);
 
 /*
 char buf[BUFSIZE];
 ssize_t bytes_received;
 socklen_t serv_len = sizeof(serv_addr);
 while ((bytes_received = recvfrom(sock, buf, BUFSIZE, 0,
 (struct sockaddr *)&serv_addr, &serv_len)) > 0) {
 fwrite(buf, 1, bytes_received, file);
 }
 */
 
 FILE *file = fopen("received_test.mp4", "wb");

 int nbyte = BUFSIZE;
 while(nbyte>= BUFSIZE){
 nbyte = recvfrom(sock, message, BUFSIZE, 0, (struct sockaddr*)&serv_addr, &adr_sz);
 fwrite(message, sizeof(char), nbyte, file);
 }

 if (file == NULL) {
 perror("File opening failed");
 exit(EXIT_FAILURE);
 }

 fclose(file);
 close(sock);
 printf("File received successfully\n");
 
 return 0;
}


I try to convert the binary file to an
.mp4file using ffmpeg
but it doesn't work :

ffmpeg -i received_test.mp4 output.mp4
ffmpeg version 7.0 Copyright (c) 2000-2024 the FFmpeg developers
 built with Apple clang version 15.0.0 (clang-1500.3.9.4)
 configuration: --prefix=/opt/homebrew/Cellar/ffmpeg/7.0 --enable-shared --enable-pthreads --enable-version3 --cc=clang --host-cflags= --host-ldflags='-Wl,-ld_classic' --enable-ffplay --enable-gnutls --enable-gpl --enable-libaom --enable-libaribb24 --enable-libbluray --enable-libdav1d --enable-libharfbuzz --enable-libjxl --enable-libmp3lame --enable-libopus --enable-librav1e --enable-librist --enable-librubberband --enable-libsnappy --enable-libsrt --enable-libssh --enable-libsvtav1 --enable-libtesseract --enable-libtheora --enable-libvidstab --enable-libvmaf --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libxvid --enable-lzma --enable-libfontconfig --enable-libfreetype --enable-frei0r --enable-libass --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopenvino --enable-libspeex --enable-libsoxr --enable-libzmq --enable-libzimg --disable-libjack --disable-indev=jack --enable-videotoolbox --enable-audiotoolbox --enable-neon
 libavutil 59. 8.100 / 59. 8.100
 libavcodec 61. 3.100 / 61. 3.100
 libavformat 61. 1.100 / 61. 1.100
 libavdevice 61. 1.100 / 61. 1.100
 libavfilter 10. 1.100 / 10. 1.100
 libswscale 8. 1.100 / 8. 1.100
 libswresample 5. 1.100 / 5. 1.100
 libpostproc 58. 1.100 / 58. 1.100
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x12a62bdb0] Format mov,mp4,m4a,3gp,3g2,mj2 detected only with low score of 1, misdetection possible!
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x12a62bdb0] moov atom not found
[in#0 @ 0x12b0043c0] Error opening input: Invalid data found when processing input
Error opening input file received_test.mp4.
Error opening input files: Invalid data found when processing input


-
lavu/opt : Clarify the scope of AVOptions
24 avril 2024, par Andrew Sayerslavu/opt : Clarify the scope of AVOptions
See discussion on the mailing list :
https://ffmpeg.org/pipermail/ffmpeg-devel/2024-April/326054.htmlSigned-off-by : Michael Niedermayer <michael@niedermayer.cc>
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What Are Website KPIs (10 KPIs and Best Ways to Track Them)
3 mai 2024, par ErinTrying to improve your website’s performance ?
Have you ever heard the phrase, “What gets measured gets managed ?”
To improve, you need to start crunching your numbers.
The question is, what numbers are you supposed to track ?
If you want to improve your conversions, then you need to track your website KPIs.
In this guide, we’ll break down the top website KPIs you need to be tracking and how you can track them so you can double down on what’s working with your website (and ditch what’s not).
Let’s begin.
What are website KPIs ?
Before we dive into website KPIs, let’s define “KPI.”
A KPI is a key performance indicator.
You can use this measurable metric to track progress toward a specific objective.
A website KPI is a metric to track progress towards a specific website performance objective.
Website KPIs help your business identify strengths and weaknesses on your website, activities you’re doing well (and those you’re struggling with).
Web KPIs can give you and your team a target to reach with simple checkpoints to show you whether you’re on the right track toward your goals.
By tracking website KPIs regularly, you can ensure your organisation performs consistently at a high level.
Whether you’re looking to improve your traffic, leads or revenue, keeping a close eye on your website KPIs can help you reach your goals.
10 Website KPIs to track
If you want to improve your site’s performance, you need to track the right KPIs.
While there are plenty of web analytics solutions on the market today, below we’ll cover KPIs that are automatically tracked in Matomo (and don’t require any configuration).
Here are the top 10 website KPIs you need to track to improve site performance and grow your brand :
1. Pageviews
Website pageviews are one of the most important KPIs to track.
What is it exactly ?
It’s simply the number of times a specific web page has been viewed on your site in a specific time period.
For example, your homepage might have had 327 pageviews last month, and only 252 this month.
This is a drop of 23%.
A drop in pageviews could mean your search engine optimisation or traffic campaigns are weakening. Alternatively, if you see pageviews rise, it could mean your marketing initiatives are performing well.
High or low pageviews could also indicate potential issues on specific pages. For example, your visitors might have trouble finding specific pages if you have poor website structure.
2. Average time on page
Now that you understand pageviews, let’s talk about average time on page.
This is simple : it’s the average amount of time your visitors spend on a particular web page on your site.
This isn’t the average time they spend on your website but on a specific page.
If you’re finding that you’re getting steady traffic to a specific web page, but the average time on the page is low, it may mean the content on the page needs to be updated or optimised.
Tracking your average time on page is important, as the longer someone stays on a page, the better the experience.
This isn’t a hard and fast rule, though. For specific types of content like knowledge base articles, you may want a shorter period of time on page to ensure someone gets their answer quickly.
3. Bounce rate
Bounce rate sounds fun, right ?
Well, it’s not usually a good thing for your website.
A bounce rate is how many users entered your website but “bounced” away without clicking through to another page.
Your bounce rate is a key KPI that helps you determine the quality of your content and the user experience on individual pages.
You could be getting plenty of traffic to your site, but if the majority are bouncing out before heading to new pages, it could mean that your content isn’t engaging enough for your visitors.
Remember, like average time on page, your bounce rate isn’t a black-and-white KPI.
A higher bounce rate may mean your site visitors got exactly what they needed and are pleased.
But, if you have a high bounce rate on a product page or a landing page, that is a sign you need to optimise the page.
4. Exit rate
Bounce rate is the percentage of people who left the website after visiting one page.
Exit rate, on the other hand, is the percentage of website visits that ended on a specific page.
For example, you may find that a blog post you wrote has a 19% exit rate and received 1,000 visits that month. This means out of the 1,000 people who viewed this page, 190 exited after visiting it.
On the other hand, you may find that a second blog post has 1,000 pageviews, but a 10% exit rate, with only 100 people leaving the site after visiting this page.
What could this mean ?
This means the second page did a better job keeping the person on your website longer. This could be because :
- It had more engaging content, keeping the visitors’ interest high
- It had better internal links to other relevant pieces of content
- It had a better call to action, taking someone to another web page
If you’re an e-commerce store and notice that your exit rate is higher on your product, cart or checkout pages, you may need to adjust those pages for better conversions.
5. Average page load time
Want to know another reason you may have a high exit rate or bounce rate on a page ?
Your page load time.
The average page load time is the average time it takes (in seconds) from the moment you click through to a page until it has fully rendered within your browser.
In other words, it’s the time it takes after you click on a page for it to be fully functional.
Your average load time is a crucial website KPI because it significantly impacts page performance and the user experience.
How important is your page load time ?
Nearly 53% of website visitors expect e-commerce pages to load in 3 seconds or less.
You will likely lose visitors if your pages take too long to load.
You could have the best content on a web page, but if it takes too long to load, your visitors will bounce, exit, or simply be frustrated.
6. Conversions
Conversions.
It’s one of the most popular words in digital marketing circles.
But what does it mean ?
A conversion is simply the number of times someone takes a specific action on your website.
For example, it could be wanting someone to :
- Read a blog post
- Click an external link
- Download a PDF guide
- Sign up to your email list
- Comment on your blog post
- Watch a new video you uploaded
- Purchase a limited-edition product
- Sign up for a free trial of your software
To start tracking conversions, you need to first decide what your business goals are for your website.
With Matomo, you can set up conversions easily through the Goals feature. Simply set up your website goals, and Matomo will automatically track the conversions towards that objective (as a goal completion).
Simply choose what conversion you want to track, and you can analyse when conversions occur through the Matomo platform.
7. Conversion rate
Now that you know what a conversion is, it’s time to talk about conversion rate.
This key website KPI will help you analyse your performance towards your goals.
Conversion rate is simply the percentage of visitors who take a desired action, like completing a purchase, signing up for a newsletter, or filling out a form, out of the total number of visitors to your website or landing page.
Understanding this percentage can help you plan your marketing strategy to improve your website and business performance.
For instance, let’s say that 2% of your website visitors purchase a product on your digital storefront.
Knowing this, you could tweak different levers to increase your sales.
If your average order value is $50 and you get 100,000 visits monthly, you make about $100,000.
Let’s say you want to increase your revenue.
One option is to increase your traffic by implementing campaigns to increase different traffic sources, such as social media ads, search ads, organic social traffic, and SEO.
If you can get your traffic to 120,000 visitors monthly, you can increase your revenue to $120,000 — an additional $20,000 monthly for the extra 20,000 visits.
Or, if you wanted to increase revenue, you could ignore traffic growth and simply improve your website with conversion rate optimisation (CRO).
CRO is the practice of making changes to your website or landing page to encourage more visitors to take the desired action.
If you can get your conversion rate up to 2.5%, the calculation looks like this :
100,000 visits x $50 average order value x 2.5% = $125,000/month.
8. Average time spent on forms
If you want more conversions, you need to analyse forms.
Why ?
Form analysis is crucial because it helps you pinpoint where users might be facing obstacles.
By identifying these pain points, you can refine the form’s layout and fields to enhance the user experience, leading to higher conversion rates.
In particular, you should track the average time spent on your forms to understand which ones might be causing frustration or confusion.
The average time a visitor spends on a form is calculated by measuring the duration between their first interaction with a form field (such as when they focus on it) and their final interaction.
Find out how Concrete CMS tripled their leads using Form Analytics.
9. Play rate
One often overlooked website KPI you need to be tracking is play rate.
What is it exactly ?
The percentage of visitors who click “play” on a video or audio media format on a specific web page.
For example, if you have a video on your homepage, and 50 people watched it out of the 1,000 people who visited your website today, you have a play rate of 5%.
Play rate lets you track whenever someone consumes a particular piece of audio or video content on your website, like a video, podcast, or audiobook.
Not all web analytics solutions offer media analytics. However, Matomo lets you track your media like audio and video without the need for configuration, saving you time and upkeep.
10. Actions per visit
Another crucial website KPI is actions per visit.
This is the average number of interactions a visitor has with your website during a single visit.
For example, someone may visit your website, resulting in a variety of actions :
- Downloading content
- Clicking external links
- Visiting a number of pages
- Conducting specific site searches
Actions per visit is a core KPI that indicates how engaging your website and content are.
The higher the actions per visit, the more engaged your visitors typically are, which can help them stay longer and eventually convert to paying customers.
Track your website KPIs with Matomo today
Running a website is no easy task.
There are dozens of factors to consider and manage :
- Copy
- Design
- Performance
- Tech integrations
- And more
But, to improve your website and grow your business, you must also dive into your web analytics by tracking key website KPIs.
Managing these metrics can be challenging, but Matomo simplifies the process by consolidating all your core KPIs into one easy-to-use platform.
As a privacy-friendly and GDPR-compliant web analytics solution, Matomo tracks 20-40% more data than other solutions. So you gain access to 100% accurate, unsampled insights, enabling confident decision-making.
Join over 1 million websites that trust Matomo as their web analytics solution. Try it free for 21 days — no credit card required.
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