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The Slip - Artworks
26 septembre 2011, par
Mis à jour : Septembre 2011
Langue : English
Type : Texte
Autres articles (31)
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Participer à sa documentation
10 avril 2011La documentation est un des travaux les plus importants et les plus contraignants lors de la réalisation d’un outil technique.
Tout apport extérieur à ce sujet est primordial : la critique de l’existant ; la participation à la rédaction d’articles orientés : utilisateur (administrateur de MediaSPIP ou simplement producteur de contenu) ; développeur ; la création de screencasts d’explication ; la traduction de la documentation dans une nouvelle langue ;
Pour ce faire, vous pouvez vous inscrire sur (...) -
Ajouter notes et légendes aux images
7 février 2011, parPour pouvoir ajouter notes et légendes aux images, la première étape est d’installer le plugin "Légendes".
Une fois le plugin activé, vous pouvez le configurer dans l’espace de configuration afin de modifier les droits de création / modification et de suppression des notes. Par défaut seuls les administrateurs du site peuvent ajouter des notes aux images.
Modification lors de l’ajout d’un média
Lors de l’ajout d’un média de type "image" un nouveau bouton apparait au dessus de la prévisualisation (...) -
Librairies et binaires spécifiques au traitement vidéo et sonore
31 janvier 2010, parLes logiciels et librairies suivantes sont utilisées par SPIPmotion d’une manière ou d’une autre.
Binaires obligatoires FFMpeg : encodeur principal, permet de transcoder presque tous les types de fichiers vidéo et sonores dans les formats lisibles sur Internet. CF ce tutoriel pour son installation ; Oggz-tools : outils d’inspection de fichiers ogg ; Mediainfo : récupération d’informations depuis la plupart des formats vidéos et sonores ;
Binaires complémentaires et facultatifs flvtool2 : (...)
Sur d’autres sites (6099)
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10 Matomo Features You Possibly Didn’t Know About
28 octobre 2022, par ErinMost users know Matomo as the privacy-focussed web analytics tool with data accuracy, superior to Google Analytics.
And we’re thrilled to be that — and more !
At Matomo, our underlying product vision is to provide a full stack of accurate, user-friendly and privacy-mindful online marketing tools.
Over the years, we’ve expanded beyond baseline website statistics. Matomo Cloud users also get to benefit from additional powerful tools for audience segmentation, conversion optimisation, advanced event tracking and more.
Here are the top 10 advanced Matomo features you wish you knew about earlier (but won’t stop using now !).
Funnels
At first glance, most customer journeys look sporadic. But every marketer will tell you that there is a method to almost every users’ madness. Or more precisely — there’s a method you can use to guide users towards conversions.
That’s called a customer journey — a schematic set of steps and actions people complete from developing awareness and interest in your solution to consideration and finally conversion.
On average, 8 touchpoints are required to turn a prospect into a customer. Though the number can be significantly bigger in B2B sales and smaller for B2C Ecommerce websites.
With the Funnels feature, you can first map all the on-site touchpoints (desired actions) for different types of customers. Then examine the results you’re getting as prospects move through these checkbox steps.
Funnel reports provide :
- High-level metrics such as “Funnel conversion rate”, “Number of funnel conversions”, “Number of funnel entries”.
- Drilled-down reports for each funnel and each tracked action within it. This way you can track the success rates of each step and estimate their contribution to the cumulative effect.
Segmented funnel reports for specific user cohorts (with Matomo Segmentation enabled).
What makes funnels so fun (pun intended) ? The variety of use cases and configurations !
You can build funnels to track conversion rates for :
- Newsletter subscriptions
- Job board applications
- Checkout or payment
- Product landing pages
- Seasonal promo campaigns
…. And pretty much any other page where users must complete a meaningful action. So go test this out.
Form Analytics
On-site forms are a 101 tactic for lead generation. For most service businesses, a “contact request” or a “booking inquiry” submission means a new lead in your pipeline.
That said : the average on-site form conversion rates across industries stand at below 50% :
- Property – 37%
- Telecoms – 40%
- Software — 46.83%
That’s not bad, but it could be better. If only you could figure out why people abandon your forms….
Oh wait, Matomo Form Analytics can supply you with answers. Form Analytics provide real-time information on key form metrics — total views, starter rate, submitter rate, conversions and more.
Separately the average form hesitation time is also provided (in other words, the time a user contemplates if filling in a form is worth the effort). Plus, Matomo also tracks the time spent on form submission.
You can review :
- Top drop-off fields – to understand where you are losing prospects. These fields should either be removed or simplified (e.g., with a dropdown menu) to increase conversions.
- Most corrected-field – this will provide a clear indication of where your prospects are struggling with a form. Providing help text can simplify the process and increase conversions.
- Unesserary fields – with this metric, you’ll know which optional fields your leads aren’t interested in filling in and can remove them to help drive conversions.
With Form Analytics, you’ll be able to boost conversions and create a better on-site experience with accurate user data.
A/B testing
Marketing is both an art and a science. A/B testing (or split testing) helps you statistically verify which creative ideas perform better.
A good conversion rate optimisation (CRO) practice is to test different elements and to do so often to find your top contenders.
What can you split test ? Loads of things :
- Page slogans and call-to-actions
- Button or submission form placements
- Different landing page designs and layouts
- Seasonal promo offers and banners
- Pricing information
- Customer testimonial placements
More times than not, those small changes in page design or copy can lead to a double-digit lift in conversion rates. Accounting software Sage saw a 30% traffic boost after changing the homepage layout, copy and CTAs based on split test data. Depositphotos, in turn, got a 9.32% increase in account registration rate (CR) after testing a timed pop-up registration form.
The wrinkle ? A/B testing software isn’t exactly affordable, with tools averaging $119 – $1,995 per month. Plus, you then have to integrate a third-party tool with your website analytics for proper attribution — and this can get messy.
Matomo saves you the hassle in both cases. An A/B testing tool is part of your Cloud subscription and plays nicely with other features — goal tracking, heatmaps, historic visitor profiles and more.
You can run split tests with Matomo on your websites or mobile apps — and find out if version A, B, C or D is the top performer.
Advertising Conversion Exports
A well-executed search marketing or banner remarketing campaign can drive heaps of traffic to your website. But the big question is : How much of it will convert ?
The AdTech industry has a major problem with proper attribution and, because of it, with ad fraud.
Globally, digital ad fraud will cost advertisers a hefty $8 billion by the end of 2022. That’s when another $74 million in ad budgets get wasted per quarter.
The reasons for ad budget waste may vary, but they often have a common denominator : lack of reliable conversion tracking data.
Matomo helps you get a better sense of how you spend your cents with Advertising Conversion Reports. Unlike other MarTech analytics tools, you don’t need to embed any third-party advertising network trackers into your website or compromise user privacy.
Instead, you can easily export accurate conversion data from Matomo (either manually via a CSV file or automated with an HTTPS link) into your Google Ads, Microsoft Advertising or Yandex Ads for cross-validation. This way you can get an objective view of the performance of different campaigns and optimise your budget allocations accordingly.
Find out more about tracking ad campaigns with Matomo.
Matomo Tag Manager
The marketing technology landscape is close to crossing 10,000 different solutions. Cross-platform advertising trackers and all sorts of customer data management tools comprise the bulk of that growing stack.
Remember : Each new tool embed adds extra “weight” to your web page. More tracking scripts equal slower page loading speed — and more frustration for your users. Likewise, extra embeds often means dialling up the developer (which takes time). Or tinkering with the site code yourself (which can result in errors and still raise the need to call a developer).
With Tag Manager, you can easily generate tags for :
- Custom analytics reports
- Newsletter signups
- Affiliates
- Form submission tracking
- Exit popups and surveys
- Ads and more
With Matomo Tag Manager, you can monitor, update or delete everything from one convenient interface. Finally, you can programme custom triggers — conditions when the tag gets activated — and specify data points (variables) it should collect. The latter is a great choice for staying privacy-focused and excluding any sensitive user information from processing.
With our tag management system (TMS), no rogue tags will mess up your analytics or conversion tracking.
Session recordings
User experience (UX) plays a pivotal role in your conversion rates.
A five-year McKinsey study of 300 publicly listed companies found that companies with strong design practices have 32 percentage points higher revenue growth than their peers.
But what makes up a great website design and browsing experience ? Veteran UX designers name seven qualities :
Source : Semantic Studios To figure out if your website meets all these criteria, you can use Session Recording — a tool for recording how users interact with your website.
By observing clicks, mouse moves, scrolls and form interactions you can determine problematic website design areas such as poor header navigation, subpar button placements or “boring” blocks of text.
Such observational studies are a huge part of the UX research process because they provide unbiased data on interaction. Or as Nielsen Norman Group puts it :
“The way to get user data boils down to the basic rules of usability :
- Watch what people actually do.
- Do not believe what people say they do.
- Definitely don’t believe what people predict they may do in the future.”
Most user behaviour analytics tools sell such functionality for a fee. With Matomo Cloud, this feature is included in your subscription.
Heatmaps
While Session Replays provide qualitative insights, Heatmaps supply you with first-hand qualitative insights. Instead of individual user browsing sessions, you get consolidated data on where they click and how they scroll through your website.
Heatmaps are another favourite among UX designers and their CRO peers because you can :
- Validate earlier design decisions around information architecture, page layout, button placements and so on.
- Develop new design hypotheses based on stats and then translate them into website design improvements.
- Identify distractive no-click elements that confuse users and remove them to improve conversions.
- Locate problematic user interface (UI) areas on specific devices or operating systems and improve them for a seamless experience.
To get even more granular results, you can apply up to 100 Matomo segments to drill down on specific user groups, geographies or devices.
This way you can make data-based decisions for A/B testing, updating or redesigning your website pages.
Custom Alerts
When it comes to your website, you don’t want to miss anything big — be it your biggest sales day or a sudden nosedive in traffic.
That’s when Custom Alerts come in handy.
With a few clicks, you can set up email or text-based alerts about important website metrics. Once you hit that metric, Matomo will send a ping.
You can also set different types of Custom Alerts for your teams. For example, your website administrator can get alerted about critical technical performance issues such as a sudden spike in traffic. It can indicate a DDoS attack (in the worst case) — and timely resolution is crucial here. Or suggest that your website is going viral and you might need to provision extra computing resources to ensure optimal site performance.
Your sales team, in turn, can get alerted about new form submissions, so that they can quickly move on to lead scoring and subsequent follow-ups.
Use cases are plentiful with this feature.
Custom Dashboards and Reports
Did you know you can get a personalised view of the main Matomo dashboards ?
By design, we made different website stats available as separate widgets. Hence, you can cherry-pick which stats get a prominent spot. Moreover, you can create and embed custom widgets into your Matomo dashboard to display third-party insights (e.g., POS data).
Set up custom dashboard views for different teams, business stakeholders or clients to keep them in the loop on relevant website metrics.
Custom Reports feature, in turn, lets you slice and dice your traffic analytics the way you please. You can combine up to three different data dimensions per report and then add any number of supported metrics to get a personalised analytics report.
For example, to zoom in on your website performance in a specific target market you can apply “location” (e.g., Germany) and “action type” (e.g., app downloads) dimensions and then get segmented data on metrics such as total visits, conversion rates, revenue and more.
Get to know even more ways to customise Matomo deployment.
Roll Up Report
Need to get aggregated traffic analytics from multiple web properties, but not ready to pay $150K per year for Google Analytics 360 for that ?
We’ve got you with Roll-Up Reporting. You can get a 360-degree view into important KPIs like global revenue, conversion rates or form performance across multiple websites, online stores, mobile apps and even Intranet properties.
Setting up this feature takes minutes, but saves you hours on manually exporting and cross-mapping data from different web analytics tools.
Channel all those saved hours into more productive things like increasing your conversion rates or boosting user engagement.
Avoid Marketing Tool Sprawl with Matomo
With Matomo as your website analytics and conversion optimisation app, you don’t need to switch between different systems, interfaces or have multiple tracking codes embedded on your site.
And you don’t need to cultivate a disparate (and expensive !) MarTech tool stack — and then figure out if each of your tools is compliant with global privacy laws.
All the tools you need are conveniently housed under one roof.
Want to learn more about Matomo features ? Check out product training videos next !
21 day free trial. No credit card required.
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"wrong sample count" When reading MP4 files using OpenCV
26 octobre 2022, par Object UnknownI want to marge some mp4 videos using OpenCV library, but when I try to read those videos using
cv::VideoCapture, it outputs like that :

[mov,mp4,m4a,3gp,3g2,mj2 @ 000001EB96084B80] wrong sample count
[mov,mp4,m4a,3gp,3g2,mj2 @ 000001EB96084B80] wrong sample count
[mov,mp4,m4a,3gp,3g2,mj2 @ 000001EB96084B80] wrong sample count
[mov,mp4,m4a,3gp,3g2,mj2 @ 000001EB96084B80] wrong sample count
[mov,mp4,m4a,3gp,3g2,mj2 @ 000001EB96084B80] wrong sample count
[h264 @ 000001EB9AAE9D80] co located POCs unavailable
[h264 @ 000001EB9AAE7D80] co located POCs unavailable
[mov,mp4,m4a,3gp,3g2,mj2 @ 000001EB96084B80] wrong sample count
[mov,mp4,m4a,3gp,3g2,mj2 @ 000001EB96084B80] wrong sample count
[h264 @ 000001EB9A128600] co located POCs unavailable
[h264 @ 000001EB9A129840] co located POCs unavailable
[mov,mp4,m4a,3gp,3g2,mj2 @ 000001EB96084B80] wrong sample count
[mov,mp4,m4a,3gp,3g2,mj2 @ 000001EB96084B80] wrong sample count
[mov,mp4,m4a,3gp,3g2,mj2 @ 000001EB96084B80] wrong sample count
[mov,mp4,m4a,3gp,3g2,mj2 @ 000001EB96084B80] wrong sample count
[mov,mp4,m4a,3gp,3g2,mj2 @ 000001EB96084B80] wrong sample count
[mov,mp4,m4a,3gp,3g2,mj2 @ 000001EB9AA28E40] wrong sample count
[mov,mp4,m4a,3gp,3g2,mj2 @ 000001EB96084B80] wrong sample count
[mov,mp4,m4a,3gp,3g2,mj2 @ 000001EB96084B80] wrong sample count
[h264 @ 000001EB9A169B00] co located POCs unavailable
[h264 @ 000001EB9A16B680] co located POCs unavailable
[mov,mp4,m4a,3gp,3g2,mj2 @ 000001EB96084B80] wrong sample count
[mov,mp4,m4a,3gp,3g2,mj2 @ 000001EB96084B80] wrong sample count
[mov,mp4,m4a,3gp,3g2,mj2 @ 000001EB96084B80] wrong sample count
[mov,mp4,m4a,3gp,3g2,mj2 @ 000001EB96084B80] wrong sample count
[mov,mp4,m4a,3gp,3g2,mj2 @ 000001EB96084B80] wrong sample count
[mov,mp4,m4a,3gp,3g2,mj2 @ 000001EB96084B80] wrong sample count
[mov,mp4,m4a,3gp,3g2,mj2 @ 000001EB96084B80] wrong sample count
[mov,mp4,m4a,3gp,3g2,mj2 @ 000001EB96084B80] wrong sample count
[mov,mp4,m4a,3gp,3g2,mj2 @ 000001EB96084B80] wrong sample count
[h264 @ 000001EB960CD680] co located POCs unavailable
[h264 @ 000001EB960CC8C0] co located POCs unavailable
[mov,mp4,m4a,3gp,3g2,mj2 @ 000001EB96084B80] wrong sample count
[mov,mp4,m4a,3gp,3g2,mj2 @ 000001EB96084B80] wrong sample count
[mov,mp4,m4a,3gp,3g2,mj2 @ 000001EB96084B80] wrong sample count
[h264 @ 000001EB9A81DDC0] co located POCs unavailable
[h264 @ 000001EB9A81B000] co located POCs unavailable
[mov,mp4,m4a,3gp,3g2,mj2 @ 000001EB96084B80] wrong sample count
[mov,mp4,m4a,3gp,3g2,mj2 @ 000001EB96084B80] wrong sample count
[mov,mp4,m4a,3gp,3g2,mj2 @ 000001EB96084B80] wrong sample count
[mov,mp4,m4a,3gp,3g2,mj2 @ 000001EB96084B80] wrong sample count
[mov,mp4,m4a,3gp,3g2,mj2 @ 000001EB96084B80] wrong sample count
[mov,mp4,m4a,3gp,3g2,mj2 @ 000001EB96084B80] wrong sample count
[mov,mp4,m4a,3gp,3g2,mj2 @ 000001EB96084B80] wrong sample count
[mov,mp4,m4a,3gp,3g2,mj2 @ 000001EB96084B80] wrong sample count
[h264 @ 000001EB960CB200] co located POCs unavailable
[h264 @ 000001EB960CBFC0] co located POCs unavailable
[mov,mp4,m4a,3gp,3g2,mj2 @ 000001EB96084B80] wrong sample count
[mov,mp4,m4a,3gp,3g2,mj2 @ 000001EB96084B80] wrong sample count
[h264 @ 000001EB99F206C0] co located POCs unavailable
[h264 @ 000001EB99F20B40] co located POCs unavailable
[mov,mp4,m4a,3gp,3g2,mj2 @ 000001EB96084B80] wrong sample count
[mov,mp4,m4a,3gp,3g2,mj2 @ 000001EB96084B80] wrong sample count
[mov,mp4,m4a,3gp,3g2,mj2 @ 000001EB96084B80] wrong sample count
[h264 @ 000001EB9A81D480] co located POCs unavailable
[h264 @ 000001EB9A81B000] co located POCs unavailable
[mov,mp4,m4a,3gp,3g2,mj2 @ 000001EB96084B80] wrong sample count
[mov,mp4,m4a,3gp,3g2,mj2 @ 000001EB96084B80] wrong sample count
[mov,mp4,m4a,3gp,3g2,mj2 @ 000001EB96084B80] wrong sample count
[h264 @ 000001EB9AD02C00] co located POCs unavailable
[h264 @ 000001EB9AD02300] co located POCs unavailable
[mov,mp4,m4a,3gp,3g2,mj2 @ 000001EB96084B80] wrong sample count
[mov,mp4,m4a,3gp,3g2,mj2 @ 000001EB96084B80] wrong sample count
[mov,mp4,m4a,3gp,3g2,mj2 @ 000001EB96084B80] wrong sample count
[mov,mp4,m4a,3gp,3g2,mj2 @ 000001EB96084B80] wrong sample count
[mov,mp4,m4a,3gp,3g2,mj2 @ 000001EB96084B80] wrong sample count
[mov,mp4,m4a,3gp,3g2,mj2 @ 000001EB96084B80] wrong sample count
[h264 @ 000001EB9A81B480] co located POCs unavailable
[h264 @ 000001EB9A81B940] co located POCs unavailable
[mov,mp4,m4a,3gp,3g2,mj2 @ 000001EB96084B80] wrong sample count
[mov,mp4,m4a,3gp,3g2,mj2 @ 000001EB96084B80] wrong sample count
[h264 @ 000001EB9AD02780] co located POCs unavailable
[h264 @ 000001EB9AD01E40] co located POCs unavailable
[mov,mp4,m4a,3gp,3g2,mj2 @ 000001EB96084B80] wrong sample count
[mov,mp4,m4a,3gp,3g2,mj2 @ 000001EB96084B80] wrong sample count
[mov,mp4,m4a,3gp,3g2,mj2 @ 000001EB96084B80] wrong sample count
[mov,mp4,m4a,3gp,3g2,mj2 @ 000001EB96084B80] wrong sample count
[mov,mp4,m4a,3gp,3g2,mj2 @ 000001EB96084B80] wrong sample count
[mov,mp4,m4a,3gp,3g2,mj2 @ 000001EB96084B80] wrong sample count
[mov,mp4,m4a,3gp,3g2,mj2 @ 000001EB96084B80] wrong sample count
[mov,mp4,m4a,3gp,3g2,mj2 @ 000001EB96084B80] wrong sample count
[mov,mp4,m4a,3gp,3g2,mj2 @ 000001EB96084B80] wrong sample count


and just exited with exit value 0. I want to know why it is reporting this and how to solve it please.


Heres my demo code :


#include <string>
#include <iostream>
#include <opencv2></opencv2>core/core.hpp>
#include <opencv2></opencv2>video/video.hpp>
#include <opencv2></opencv2>imgproc/imgproc.hpp>
#include <opencv2></opencv2>videoio/videoio.hpp>
#include <opencv2></opencv2>highgui/highgui.hpp>

int main()
{
 cv::Mat frame;
 cv::VideoCapture vcap;
 for (int i = 1; i <= 60; i++)
 {
 if (!vcap.open("G:\\Users\\15819\\Desktop\\Demo\\demo (" + std::to_string(i) + ").mp4"))
 {
 std::cout << "Failed to Open File: demo (" << i << ").mp4" << std::endl;
 continue;
 }
 while (!vcap.read(frame))
 cv::imshow("video", frame);
 }
 return 0;
}
</iostream></string>

I installed the
OpenCVandFFmpeglibrary usingvcpkg, here's the library information (displayed byvcpkg listcommand) :

ffmpeg:x64-windows 4.4.1#21 a library to decode, encode, transcode, mux, dem...
ffmpeg:x86-windows 4.4.1#21 a library to decode, encode, transcode, mux, dem...
ffmpeg[avcodec]:x64-windows Build the avcodec library
ffmpeg[avcodec]:x86-windows Build the avcodec library
ffmpeg[avdevice]:x64-windows Build the avdevice library
ffmpeg[avdevice]:x86-windows Build the avdevice library
ffmpeg[avfilter]:x64-windows Build the avfilter library
ffmpeg[avfilter]:x86-windows Build the avfilter library
ffmpeg[avformat]:x64-windows Build the avformat library
ffmpeg[avformat]:x86-windows Build the avformat library
ffmpeg[openh264]:x64-windows H.264 de/encoding via openh264
ffmpeg[openh264]:x86-windows H.264 de/encoding via openh264
ffmpeg[swresample]:x64-windows Build the swresample library
ffmpeg[swresample]:x86-windows Build the swresample library
ffmpeg[swscale]:x64-windows Build the swscale library
ffmpeg[swscale]:x86-windows Build the swscale library
opencv4:x64-windows 4.6.0#6 computer vision library
opencv4:x86-windows 4.6.0#6 computer vision library
opencv4[default-features]:x64-windows Platform-dependent default features
opencv4[default-features]:x86-windows Platform-dependent default features
opencv4[dnn]:x64-windows Enable dnn module
opencv4[dnn]:x86-windows Enable dnn module
opencv4[ffmpeg]:x64-windows ffmpeg support for opencv
opencv4[ffmpeg]:x86-windows ffmpeg support for opencv
opencv4[jpeg]:x64-windows JPEG support for opencv
opencv4[jpeg]:x86-windows JPEG support for opencv
opencv4[png]:x64-windows PNG support for opencv
opencv4[png]:x86-windows PNG support for opencv
opencv4[qt]:x64-windows Qt GUI support for opencv
opencv4[qt]:x86-windows Qt GUI support for opencv
opencv4[quirc]:x64-windows Enable QR code module
opencv4[quirc]:x86-windows Enable QR code module
opencv4[tiff]:x64-windows TIFF support for opencv
opencv4[tiff]:x86-windows TIFF support for opencv
opencv4[webp]:x64-windows WebP support for opencv
opencv4[webp]:x86-windows WebP support for opencv
opencv:x64-windows 4.6.0 Computer vision library
opencv:x86-windows 4.6.0 Computer vision library
opencv[default-features]:x64-windows Platform-dependent default features
opencv[default-features]:x86-windows Platform-dependent default features
opencv[dnn]:x64-windows Enable dnn module
opencv[dnn]:x86-windows Enable dnn module
opencv[jpeg]:x64-windows JPEG support for opencv
opencv[jpeg]:x86-windows JPEG support for opencv
opencv[png]:x64-windows PNG support for opencv
opencv[png]:x86-windows PNG support for opencv
opencv[quirc]:x64-windows Enable QR code module
opencv[quirc]:x86-windows Enable QR code module
opencv[tiff]:x64-windows TIFF support for opencv
opencv[tiff]:x86-windows TIFF support for opencv
opencv[webp]:x64-windows WebP support for opencv
opencv[webp]:x86-windows WebP support for opencv


Other Environments :


OS: Windows 11 x64 Professional Workstation
IDE: Visual Studio 2022
Project C++ Standard: C++14
Project Platform: x64 Release


-
Why convert wav to mp3 get different length
13 avril 2022, par sybilI use NAudio and NAudio.Lame to convert a wav file to mp3 file,code like that :


using var reader = new WaveFileReader(file);
using var ms = new MemoryStream();
var writer = new LameMP3FileWriter(ms, reader.WaveFormat, 32);
reader.CopyTo(writer);
writer.Flush();
File.WriteAllBytes(file.Replace("wav", "mp3"), ms.ToArray());


the wav file length is 1500ms,but the mp3 file length is 1557ms.


And I do the same thing by using ffmpeg.exe,command like that :


ffmpeg -i c:\2\xxx.wav c:\2\xxx.mp3


the output info :


ffmpeg version 5.0.1-essentials_build-www.gyan.dev Copyright (c) 2000-2022 the FFmpeg developers
 built with gcc 11.2.0 (Rev7, Built by MSYS2 project)
 configuration: --enable-gpl --enable-version3 --enable-static --disable-w32threads --disable-autodetect --enable-fontconfig --enable-iconv --enable-gnutls --enable-libxml2 --enable-gmp --enable-lzma --enable-zlib --enable-libsrt --enable-libssh --enable-libzmq --enable-avisynth --enable-sdl2 --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxvid --enable-libaom --enable-libopenjpeg --enable-libvpx --enable-libass --enable-libfreetype --enable-libfribidi --enable-libvidstab --enable-libvmaf --enable-libzimg --enable-amf --enable-cuda-llvm --enable-cuvid --enable-ffnvcodec --enable-nvdec --enable-nvenc --enable-d3d11va --enable-dxva2 --enable-libmfx --enable-libgme --enable-libopenmpt --enable-libopencore-amrwb --enable-libmp3lame --enable-libtheora --enable-libvo-amrwbenc --enable-libgsm --enable-libopencore-amrnb --enable-libopus --enable-libspeex --enable-libvorbis --enable-librubberband
 libavutil 57. 17.100 / 57. 17.100
 libavcodec 59. 18.100 / 59. 18.100
 libavformat 59. 16.100 / 59. 16.100
 libavdevice 59. 4.100 / 59. 4.100
 libavfilter 8. 24.100 / 8. 24.100
 libswscale 6. 4.100 / 6. 4.100
 libswresample 4. 3.100 / 4. 3.100
 libpostproc 56. 3.100 / 56. 3.100
Guessed Channel Layout for Input Stream #0.0 : mono
Input #0, wav, from 'c:\2\xxx.wav':
 Duration: 00:00:01.50, bitrate: 768 kb/s
 Stream #0:0: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 48000 Hz, mono, s16, 768 kb/s
Stream mapping:
 Stream #0:0 -> #0:0 (pcm_s16le (native) -> mp3 (libmp3lame))
Press [q] to stop, [?] for help
Output #0, mp3, to 'c:\2\xxx.mp3':
 Metadata:
 TSSE : Lavf59.16.100
 Stream #0:0: Audio: mp3, 48000 Hz, mono, s16p
 Metadata:
 encoder : Lavc59.18.100 libmp3lame
size= 12kB time=00:00:01.51 bitrate= 66.2kbits/s speed= 137x
video:0kB audio:12kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 1.928711%


And I get a mp3 file which length is 1536ms.
So,why the length changed ?
Thanks for reading.


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