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• Protecting consumer privacy : How to ensure CCPA compliance

  18 août 2023, par Erin — CCPA, Privacy

  The California Consumer Privacy Act (CCPA) is a state law that enhances privacy rights and consumer protection for residents of California. 

  It grants consumers six rights, like the right to know what personal information is being collected about them by businesses and others. 

  CCPA also requires businesses to provide notice of data collection practices. Consumers can choose to opt out of the sale of their data. 

  In this article, we’ll learn more about the scope of CCPA, the penalties for non-compliance and how our web analytics tool, Matomo, can help you create a CCPA-compliant framework.

  What is the CCPA ? 

  CCPA was implemented on January 1, 2020. It ensures that businesses securely handle individuals’ personal information and respect their privacy in the digital ecosystem. 

  

  CCPA addresses the growing concerns over privacy and data protection ; 40% of US consumers share that they’re worried about digital privacy. With the increasing amount of personal information being collected and shared by businesses, there was a need to establish regulations to provide individuals with more control and transparency over their data. 

  CCPA aims to protect consumer privacy rights and promote greater accountability from businesses when handling personal information.

  Scope of CCPA 

  The scope of CCPA includes for-profit businesses that collect personal information from California residents, regardless of where you run the business from.

  It defines three thresholds that determine the inclusion criteria for businesses subject to CCPA regulations. 

  Businesses need to abide by CCPA if they meet any of the three options :

  1. Revenue threshold : Have an annual gross revenue of over $25 million.
  2. Consumer threshold : Businesses that purchase, sell or distribute the personal information of 100,000 or more consumers, households or devices.
  3. Data threshold : Businesses that earn at least half of their revenue annually from selling the personal information of California residents.

  What are the six consumer rights under the CCPA ? 

  Here’s a short description of the six consumer rights. 

  

  1. Right to know : Under this right, you can ask a business to disclose specific personal information they collect about you and the categories of sources of the information. You can also know the purpose of collection and to which third-party the business will disclose this info. This allows consumers to understand what information is being held and how it is used. You can request this info for free twice a year.
  2. Right to delete : Consumers can request the deletion of their personal information. Companies must comply with some exceptions.
  3. Right to opt-out : Consumers can deny the sale of their personal information. Companies must provide a link on their homepage for users to exercise this right. After you choose this, companies can’t sell your data unless you authorise them to do so later.
  4. Right to non-discrimination : Consumers cannot be discriminated against for exercising their CCPA rights. For instance, a company cannot charge different prices, provide a different quality of service or deny services.
  5. Right to correct : Consumers can request to correct inaccurate personal information.

  6. Right to limit use : Consumers can specify how they want the businesses to use their sensitive personal information. This includes social security numbers, financial account details, precise geolocation data or genetic data. Consumers can direct businesses to use this sensitive information only for specific purposes, such as providing the requested services.

  Penalties for CCPA non-compliance 

  52% of organisations have yet to adopt CCPA principles as of 2022. Non-compliance can attract penalties.

  

  Section 1798.155 of the CCPA states that any business that doesn’t comply with CCPA’s terms can face penalties based on the consumer’s private right to action. Consumers can directly take the company to the civil court and don’t need prosecutors’ interventions. 

  Businesses get a chance of 30 days to make amends for their actions. 

  If that’s also not possible, the business may receive a civil penalty of up to $2,500 per violation. Violations can be of any kind, even accidental. An intentional violation can attract a fine of $7,500. 

  Consumers can also initiate private lawsuits to claim damages that range from $100 to $750, or actual damages (whichever is higher), for each occurrence of their unredacted and unencrypted data being breached on a business’s server.

  CCPA vs. GDPR 

  Both CCPA and GDPR aim to enhance individuals’ control over their personal information and provide transparency about how their data is collected, used and shared. The comparison between the CCPA and GDPR is crucial in understanding the regulatory framework of data protection laws.

  Here’s how CCPA and GDPR differ :

  Scope

  • CCPA is for businesses that meet specific criteria and collect personal information from California residents. 
  • GDPR (General Data Protection Regulation) applies to businesses that process the personal data of citizens and residents of the European Union.

  Definition of personal information

  • CCPA includes personal information broadly, including identifiers such as IP addresses and households. Examples include name, email id, location and browsing history. However, it excludes HIPAA-protected medical data, clinical trial data and other personal information from government records.
  • GDPR covers any personal data relating to an identified or identifiable individual, excluding households. Examples include the phone number, email address and personal identification number. It excludes anonymous and deceased person’s data.

  

  Consent

  • Under the CCPA, consumers can opt out of the sale of their personal information.
  • GDPR states that organisations should obtain explicit consent from individuals for processing their personal data.

  Rights

  • CCPA grants the right to know what personal information is being collected and the right to request deletion of their personal information.
  • GDPR also gives individuals various rights, such as the right to access and rectify their personal data, the right to erasure (also known as the right to be forgotten) and also the right to data portability. 

  Enforcement

  • For CCPA, businesses may have to pay $7,500 for each violation. 
  • GDPR has stricter penalties for non-compliance, with fines of up to 4% of the global annual revenue of a company or €20 million, whichever is higher.

  A 5-step CCPA compliance framework 

  Here’s a simple framework you can follow to ensure compliance with CCPA. Alongside this, we’ll also share how Matomo can help. 

  Matomo is an open-source web analytics platform trusted by organisations like the United Nations, NASA and more. It provides valuable insights into website traffic, visitor behaviour and marketing effectiveness. More than 1 million websites and apps (approximately 1% of the internet !) use our solution, and it’s available in 50+ languages. Below, we’ll share how you can use Matomo to be CCPA compliant.

  1. Assess data

  First, familiarise yourself with the California Consumer Privacy Act and check your eligibility for CCPA compliance. 

  For example, as mentioned earlier, one threshold is : purchases, receives or sells the personal data of 100,000 or more individuals or households. 

  But how do you know if you have crossed 100K ? With Matomo ! 

  Go to last year’s calendar, select visitors, then go to locations and under the “Region” option, check for California. If you’ve crossed 100K visitors, you know you have to become CCPA compliant.

  

  Identify and assess the personal information you collect with Matomo.

  2. Evaluate privacy practices

  Review the current state of your privacy policies and practices. Conduct a thorough assessment of data sharing and third-party agreements. Then, update policies and procedures to align with CCPA requirements.

  For example, you can anonymise IP addresses with Matomo to ensure that user data collected for web analytics purposes cannot be used to trace back to specific individuals.

  

  If you have a consent management solution to honour user requests for data privacy, you can also integrate Matomo with it. 

  3. Communicate 

  Inform consumers about their CCPA rights and how you handle their data.

  Establish procedures for handling consumer requests and obtaining consent. For example, you can add an opt-out form on your website with Matomo. Or you can also use Matomo to disable cookies from your website.

  

  Documenting your compliance efforts, including consumer requests and how you responded to them, is a good idea. Finally, educate staff on CCPA compliance and their responsibilities to work collaboratively.

  4. Review vendor contracts

  Assessing vendor contracts allows you to determine if they include necessary data processing agreements. You can also identify if vendors are sharing personal information with third parties, which could pose a compliance risk. Verify if vendors have adequate security measures in place to protect the personal data they handle.

  That’s why you can review and update agreements to include provisions for data protection, privacy and CCPA requirements.

  Establish procedures to monitor and review vendor compliance with CCPA regularly. This may include conducting audits, requesting certifications and implementing controls to mitigate risks associated with vendors handling personal data.

  5. Engage legal counsel

  Consider consulting with legal counsel to ensure complete understanding and compliance with CCPA regulations.

  Finally, stay updated on any changes or developments related to CCPA and adjust your compliance efforts accordingly.

  Matomo and CCPA compliance 

  There’s an increasing emphasis on privacy regulations like CCPA. Matomo offers a robust solution that allows businesses to be CCPA-compliant without sacrificing the ability to track and analyse crucial data.

  You can gain in-depth insights into user behaviour and website performance — all while prioritising data protection and privacy. 

  Request a demo or sign up for a free 21-day trial to get started with our powerful CCPA-compliant web analytics platform — no credit card required. 

  Disclaimer

  We are not lawyers and don’t claim to be. The information provided here is to help give an introduction to CCPA. We encourage every business and website to take data privacy seriously and discuss these issues with your lawyer if you have any concerns.

• Increasing Website Traffic : 11 Tips To Attract Visitors

  25 août 2023, par Erin — Analytics Tips, Marketing

  For your website and business to succeed, you need to focus on building traffic.

  However, you aren’t the only one with that goal in mind.

  There are millions of other websites trying to increase their traffic as well. With that much competition, it’s important to make sure your website stands out. Accomplishing that can require a great deal of strategy.

  We’ve compiled a list of tips to help you develop a solid plan for increasing website traffic, to expand your reach, grow your audience and boost customer engagement levels — creating more opportunities for your business.Using these tips, more visitors will find their way to your website — meaning more customers for your business.

  Why is website traffic important ?

  Website traffic is essentially the number of people visiting your website. When someone lands on your site, they’re considered a visitor and increase your website traffic. 

  When your website traffic is high, you’ll get more clicks, customer interactions and brand engagement. As a result, search engines will have a positive impression of your website and send more people there, meaning even more people will see your content and have the opportunity to buy your product.

  When using a website for your business or any other venture, tracking your website traffic using a web analytics solution like Matomo is critical.

  

  With over 200 million actively maintained and visited websites in 2023, it’s important to make sure yours stands out if you want to increase your website traffic and grow your online presence. 

  11 tips for increasing website traffic

  Here are 11 tips to increase your organic traffic and elevate your business.

  1. Perfect your SEO

  Optimising your website to show up in search engine results shouldn’t be overlooked, as 63% of consumers start researching a product by using a search engine. Search engine optimisation, or SEO, increases the visibility and discoverability of your website on search engine results pages (SERPs). SEO targets organic searches, which means it doesn’t add to social media traffic, direct traffic or referrals, and it isn’t paid traffic.

  SEO is number one on this list for a reason — most of these tips will directly, or indirectly, improve your SEO efforts. 

  Steps to improve your search engine optimisation can include :

  • Using relevant keywords that are incorporated naturally throughout your content
  • Using a web analytics tool like Matomo, with its search keyword feature, to gain insights and identify opportunities for improvement
  • Using descriptive meta titles and meta descriptions
  • Link to your own content internally with descriptive anchor tags, and make sure unused pages are removed 
  • Keeping your target audience in mind and marketing your content toward them
  • Making sure your website’s structure is optimised to be mobile-friendly, fast and responsive — such as with Matomo’s SEO Web Vitals feature, which monitors key metrics like your website’s page speed and loading performance, pivotal for optimising search engine results

  2. Research the competition

  It’s important to remember that while your business might be unique, it’s likely not the only one in its field. Thousands of other websites from other companies are also looking to improve their website traffic and increase sales, and you have to outcompete them.

  Looking at what your competitors are doing is vital from a strategic perspective. You can see what their content looks like, how they’re framing their specific use cases and what target audience they’re marketing toward.

  Knowing what your competitors are doing can help you find ways to improve your content and make it unique. Are your competitors missing a specific use case or neglecting a particular audience ? Fill in their content gaps on your website, and pick up the traffic they’re missing.

  3. Create high-quality, evergreen content

  If your content is high-quality, visitors will read more of it and stay longer on your site. This obviously increases the likelihood they will purchase your product or service, and it tells search engines that your website is a good answer for a search query.

  High-quality content will also be shared more often, leading to even more website traffic. You should aim to develop content that doesn’t lose relevance over time (aka “evergreen content”). If you include time-sensitive data, statistics or content in your website, blog posts or articles, it’ll be relevant only around that time frame. 

  While this month’s viral content is highly popular, it likely won’t be relevant in a few months. Instead, if you ensure your content is evergreen, it will continue to get engagement long after it’s published.

  4. Implement creative visuals

  It’s important to have engaging, fun and interactive media on your website to keep visitors on your site longer. Like good content, interesting visuals (and the resulting longer visits) can translate to more purchases (and favourable assessments by search engines).

  

  Media can take the form of videos, infographics, images or web graphics. 

  With Matomo’s Media Analytics feature, you can automatically gain even deeper insights into how your visitors engage with your media content, enhancing your understanding of their preferences and behaviours.

  If you have interesting, captivating visuals, visitors will be more likely to stay on your website longer and see what you have to offer. Without captivating visuals to break up walls of text, you’ll likely find visitors will tend to leave your site in favour of something more engaging.

  Just make sure you design your visuals with your target audience in mind. Flashy, fun graphics might not be a good fit for a professional audience, but they’re great for younger audiences. If you get your audience correct, they may also share the images with others. Depending on your business, that might be a useful infographic shared across LinkedIn, or a picture of a clever use case shared on Pinterest. 

  As a bonus, if other companies use your graphics on their websites, that earns you some backlinks — more on those in a bit.

  5. Create a comprehensive knowledge base

  Having a knowledge base is critical to making sure your service or product is well understood and well documented, especially in the tech industry. If a visitor or potential customer is interested in your product or service, they need to know exactly what it will do for them and that they have a good foundation of support in case they need help. A knowledge base is also a good place for internal links (more on those in a bit).

  Visitors can also use your knowledge base as a source of information, and if they cite you as a source, that’ll lead right back to more website traffic for you (see our backlinks section for more about this). If your website is a good source of information, visitors will come back to it again and again.

  6. Use social media often and consistently

  Digital marketing nowadays heavily relies on social media platforms. Having an online presence no longer means just having a website — if you’re not using social media sites, you’re missing out on a huge portion of potential visitors and customers.

  A strong social media presence with profiles on platforms like Facebook, X (formerly Twitter), Instagram or LinkedIn can be invaluable for increasing your website traffic. Visitors to your social media profiles will click on regularly shared content, read your blog posts and possibly become customers.

  Participating in relevant communities and networking with other companies in groups in your industry can also be invaluable. If you participate in online communities and forums for your niche, you can offer insight, answer questions and plug your website. All of this will increase your clicks, which will increase your website traffic.

  If you’ve managed to build your own community on social media, make sure to keep them engaged ! Implementing your own forum, hosting live chats and Q&As, offering helpful and engaging content will make sure visitors keep coming back and spreading the word. 

  7. Use email marketing or newsletters

  Having an email list and sending marketing emails or newsletters is a great way to increase website traffic. You can offer exclusive content, and promise discounts or resources to your subscribers for when they return to your website. This will help keep your loyal audience engaged, entice new customers to subscribe to your newsletter, give you a chance to upsell to people who have already expressed an interest in your product and potentially convert curious subscribers into customers.

  8. Make sure your content can earn backlinks

  A backlink is when a website links to a different website — ideally using relevant anchor text — and it’s an effective strategy for increasing referral traffic, that is, visitors who get to your website via a link on another website. The more backlinks you have, the more your referral traffic will increase. Social share buttons make it easy for people to cite you on social platforms, too. 

  We’ve already talked about making expert content that’s link-worthy, but also make sure that you’re creating linkable assets (like those interesting visuals mentioned earlier), building relationships with other sites that will link to you (like by inviting an expert or influencer to write on your page and promote it from their platform, or by writing your own guest content for their sites) and sharing your own content. All of this can help increase your referral traffic, particularly when you’re linked from websites with a higher domain authority than you have.

  You can also make sure your website is listed in online directories. Some sites will do interviews and roundups, as well — these are great opportunities to increase your backlinks.

  9. Optimise your CTR

  Click-through rate, or CTR, is the percentage of users who click on specific links to your website. A high CTR means your visitors are following a link — whether in an advertisement, a search result or a social media post — and a low CTR means they’re passing it by. Optimising your CTR can greatly improve your website traffic.

  To improve CTR, identify successful elements such as copy, imagery, and offers in your ads, enabling you to amplify effective elements and minimise less impactful ones.

  10. Ensure your website is responsive and mobile-friendly

  If a visitor is frustrated by your site being slow, laggy, clunky or not mobile-friendly, they won’t stay long. That doesn’t look good to search engines if that’s how your visitors got there. Your website needs to be clean, responsive, user-friendly and accessible.

  If your website is slow, try increasing your website’s performance by :

  • Optimising images : Reduce the size of images and compress them for faster load times. Opt for JPEG format for photos and PNG format for graphics. 
  • Limit the use of plugins : If you are using a CMS like WordPress, consider removing plugins that are unnecessary or not essential.
  • Embrace lazy loading : To further enhance site speed and reduce initial load times, set up your site to load images and content only as visitors scroll down. Prioritising the content and images at the top of the page makes the site feel faster. Some CMS platforms will offer this option, but others may require a bit of coding to set this up. 

  Many people rely on their phones to research services or products, especially if they’re doing a quick search. Make sure your website is friendly to mobile users. It should scale vertically and scroll smoothly so users aren’t frustrated when using your site. They should be able to find the info they need immediately without any technical issues.

  11. Track your website’s metrics

  As you test out each of these strategies to increase your web traffic, don’t forget to closely analyse the performance of your site. To truly understand the impact of your efforts, you’ll need a reliable web analytics solution. Think of a dependable web analytics solution as your website’s GPS. Without it, you’d be lost, unsure of your direction and missing out on valuable insights to steer your growth.

  Matomo is a powerful web analytics tool that can help you do just that by providing information on your site visitors and campaign performance, complemented by an array of behavioural analytics features that delve into user interactions. Among these, our heatmap feature stands out, enabling greater insights into user interactions and optimisation of your site’s effectiveness.

  

  Google Analytics is another powerful analytics option, though it has challenges with data accuracy ; there are multiple other web analytics solutions as well.

  Regardless of what web analytics solution you choose, the process of analysing your website metrics is incredibly important for identifying areas of improvement to increase website traffic.

  Increasing your web traffic is a process

  Increasing website traffic isn’t something you accomplish overnight. It’s a comprehensive, ongoing endeavour that requires constant analysis and fine-tuning. 

  By applying these tips to create consistent, high-quality content that gets spotlighted on search engines, shared on social media and returned to again and again, you’ll see a steady stream of increased traffic. 

  With Matomo, you can understand your visitor behaviour to see what works and what doesn’t as you work to increase your website traffic. Get your free 21-day trial now. No credit card required.

• DTS Error when nesting `amix` filter in ffmpeg [closed]

  25 août 2023, par GBathie

  I am trying to create an audio file that contains multiple occurrences of other samples (think of music notes), using ffmpeg.

  


  I am using the following command :

  


  ffmpeg -f lavfi -i 'sine=frequency=87.31:sample_rate=44100' -f lavfi -i 'sine=frequency=783.99:sample_rate=44100' -filter_complex '[0]asplit=2[s0][s1];[s0]atrim=duration=0.157[s2];[s1]atrim=duration=1.157[s3];[s2][s3]amix=inputs=2[s4];[1]atrim=duration=0.165[s5];[s4][s5]amix=inputs=2[s6]' -map '[s6]' test.mp3 -y


  


  It generates two sine waves in place of notes, and builds a file containing the first note twice, and the second note once.
I then mix the result using two amix filters. I cannot use a single amix filter because, in practice, I have more notes that the maximum number of inputs that amix can take (1024).

  


  The graph looks like this :


  


  Running this commands gives me the following output, which complains about "Queue input backwards in time" :

  


  
ffmpeg version 4.2.7-0ubuntu0.1 Copyright (c) 2000-2022 the FFmpeg developers
  built with gcc 9 (Ubuntu 9.4.0-1ubuntu1~20.04.1)
  configuration: --prefix=/usr --extra-version=0ubuntu0.1 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --arch=amd64 --enable-gpl --disable-stripping --enable-avresample --disable-filter=resample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libcodec2 --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libjack --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librsvg --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-lv2 --enable-omx --enable-openal --enable-opencl --enable-opengl --enable-sdl2 --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-nvenc --enable-chromaprint --enable-frei0r --enable-libx264 --enable-shared
  libavutil      56. 31.100 / 56. 31.100
  libavcodec     58. 54.100 / 58. 54.100
  libavformat    58. 29.100 / 58. 29.100
  libavdevice    58.  8.100 / 58.  8.100
  libavfilter     7. 57.100 /  7. 57.100
  libavresample   4.  0.  0 /  4.  0.  0
  libswscale      5.  5.100 /  5.  5.100
  libswresample   3.  5.100 /  3.  5.100
  libpostproc    55.  5.100 / 55.  5.100
Input #0, lavfi, from 'sine=frequency=87.31:sample_rate=44100':
  Duration: N/A, start: 0.000000, bitrate: 705 kb/s
    Stream #0:0: Audio: pcm_s16le, 44100 Hz, mono, s16, 705 kb/s
Input #1, lavfi, from 'sine=frequency=783.99:sample_rate=44100':
  Duration: N/A, start: 0.000000, bitrate: 705 kb/s
    Stream #1:0: Audio: pcm_s16le, 44100 Hz, mono, s16, 705 kb/s
Stream mapping:
  Stream #0:0 (pcm_s16le) -> asplit
  Stream #1:0 (pcm_s16le) -> atrim
  amix -> Stream #0:0 (libmp3lame)
Press [q] to stop, [?] for help
Output #0, mp3, to 'test.mp3':
  Metadata:
    TSSE            : Lavf58.29.100
    Stream #0:0: Audio: mp3 (libmp3lame), 44100 Hz, mono, fltp (default)
    Metadata:
      encoder         : Lavc58.54.100 libmp3lame
[libmp3lame @ 0x557929fb5400] Queue input is backward in time
    Last message repeated 1 times
[mp3 @ 0x557929fb7280] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 6959 >= -9223372036854774620
[mp3 @ 0x557929fb7280] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 6959 >= -9223372036854775760
[mp3 @ 0x557929fb7280] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 6959 >= -9223372036854775632
[mp3 @ 0x557929fb7280] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 6959 >= -9223372036854775504
[mp3 @ 0x557929fb7280] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 6959 >= -9223372036854775376
[libmp3lame @ 0x557929fb5400] Queue input is backward in time
[mp3 @ 0x557929fb7280] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 6959 >= -9223372036854775248
[mp3 @ 0x557929fb7280] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 6959 >= -9223372036854775120
[mp3 @ 0x557929fb7280] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 6959 >= -9223372036854774992
[mp3 @ 0x557929fb7280] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 6959 >= -9223372036854774864
[mp3 @ 0x557929fb7280] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 6959 >= -9223372036854775760
[mp3 @ 0x557929fb7280] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 6959 >= -9223372036854775632
[mp3 @ 0x557929fb7280] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 6959 >= -9223372036854775504
[libmp3lame @ 0x557929fb5400] Queue input is backward in time
[mp3 @ 0x557929fb7280] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 6959 >= -9223372036854775376
[mp3 @ 0x557929fb7280] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 6959 >= -9223372036854775248
[mp3 @ 0x557929fb7280] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 6959 >= -9223372036854775120
[mp3 @ 0x557929fb7280] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 6959 >= -9223372036854774992
[mp3 @ 0x557929fb7280] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 6959 >= -9223372036854774864
[mp3 @ 0x557929fb7280] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 6959 >= -9223372036854775760
[mp3 @ 0x557929fb7280] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 6959 >= -9223372036854775632
[mp3 @ 0x557929fb7280] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 6959 >= -9223372036854775504
[libmp3lame @ 0x557929fb5400] Queue input is backward in time
[mp3 @ 0x557929fb7280] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 6959 >= -9223372036854775376
[mp3 @ 0x557929fb7280] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 6959 >= -9223372036854775248
[mp3 @ 0x557929fb7280] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 6959 >= -9223372036854775120
[mp3 @ 0x557929fb7280] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 6959 >= -9223372036854774992
[mp3 @ 0x557929fb7280] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 6959 >= -9223372036854774864
[mp3 @ 0x557929fb7280] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 6959 >= -9223372036854775760
[mp3 @ 0x557929fb7280] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 6959 >= -9223372036854775632
[mp3 @ 0x557929fb7280] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 6959 >= -9223372036854775504
[libmp3lame @ 0x557929fb5400] Queue input is backward in time
[mp3 @ 0x557929fb7280] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 6959 >= -9223372036854775376
[mp3 @ 0x557929fb7280] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 6959 >= -9223372036854775248
[mp3 @ 0x557929fb7280] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 6959 >= -9223372036854775120
[mp3 @ 0x557929fb7280] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 6959 >= -9223372036854774992
[mp3 @ 0x557929fb7280] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 6959 >= -9223372036854774864
[mp3 @ 0x557929fb7280] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 6959 >= -9223372036854775760
[mp3 @ 0x557929fb7280] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 6959 >= -9223372036854775632
[mp3 @ 0x557929fb7280] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 6959 >= -9223372036854775504
[mp3 @ 0x557929fb7280] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 6959 >= -9223372036854775376
[mp3 @ 0x557929fb7280] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 6959 >= -9223372036854775248
size=      10kB time=00:00:00.18 bitrate= 428.0kbits/s speed=22.2x    
video:0kB audio:9kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 2.361386%


  


  Q : What is the issue, and how can I solve it ?

  


  Note that the issue disappears if I use a single amix filter, but I cannot do this in practice.