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  • Making Your First-Party Data Work for You and Your Customers

    11 mars, par Alex Carmona

    At last count, 162 countries had enacted data privacy policies of one kind or another. These laws or regulations, without exception, intend to eliminate the use of third-party data. That puts marketing under pressure because third-party data has been the foundation of online marketing efforts since the dawn of the Internet.

    Marketers need to future-proof their operations by switching to first-party data. This will require considerable adjustment to systems and processes, but the reward will be effective marketing campaigns that satisfy privacy compliance requirements and bring the business closer to its customers.

    To do that, you’ll need a coherent first-party data strategy. That’s what this article is all about. We’ll explain the different types of personal data and discuss how to use them in marketing without compromising or breaching data privacy regulations. We’ll also discuss how to build that strategy in your business. 

    So, let’s dive in.

    The different data types

    There are four distinct types of personal data used in marketing, each subject to different data privacy regulations.

    Before getting into the different types, it’s essential to understand that all four may comprise one or more of the following :

    Identifying dataName, email address, phone number, etc.
    Behavioural dataWebsite activity, app usage, wishlist content, purchase history, etc.
    Transactional dataOrders, payments, subscription details, etc.
    Account dataCommunication preferences, product interests, wish lists, etc.
    Demographic dataAge, gender, income level, education, etc.
    Geographic DataLocation-based information, such as zip codes or regional preferences.
    Psychographic DataInterests, hobbies and lifestyle preferences.

    First-party data

    When businesses communicate directly with customers, any data they exchange is first-party. It doesn’t matter how the interaction occurs : on the telephone, a website, a chat session, or even in person.

    Of course, the parties involved aren’t necessarily individuals. They may be companies, but people within those businesses will probably share at least some of the data with colleagues. That’s fine, so long as the data : 

    • Remains confidential between the original two parties involved, and 
    • It is handled and stored following applicable data privacy regulations.

    The core characteristic of first-party data is that it’s collected directly from customer interactions. This makes it reliable, accurate and inherently compliant with privacy regulations — assuming the collecting party complies with data privacy laws.

    A great example of first-party data use is in banking. Data collected from customer interactions is used to provide personalised services, detect fraud, assess credit risk and improve customer retention.

    Zero-party data

    There’s also a subset of first-party data, sometimes called zero-party data. It’s what users intentionally and proactively share with a business. It can be preferences, intentions, personal information, survey responses, support tickets, etc.

    What makes it different is that the collection of this data depends heavily on the user’s trust. Transparency is a critical factor, too ; visitors expect to be informed about how you’ll use their data. Consumers also have the right to withdraw permission to use all or some of their information at any time.

    Diagram showing how a first-party data strategy is built on trust and transparency

    Second-party data

    This data is acquired from a separate organisation that collects it firsthand. Second-party data is someone else’s first-party data that’s later shared with or sold to other businesses. The key here is that whoever owns that data must give explicit consent and be informed of who businesses share their data with.

    A good example is the cooperation between hotel chains, car rental companies, and airlines. They share joint customers’ flight data, hotel reservations, and car rental bookings, much like travel agents did before the internet undermined that business model.

    Third-party data

    This type of data is the arch-enemy of lawmakers and regulators trying to protect the personal data of citizens and residents in their country. It’s information collected by entities that have no direct relationship with the individuals whose data it is.

    Third-party data is usually gathered, aggregated, and sold by data brokers or companies, often by using third-party cookies on popular websites. It’s an entire business model — these third-party brokers sell data for marketing, analytics, or research purposes. 

    Most of the time, third-party data subjects are unaware that their data has been gathered and sold. Hence the need for strong data privacy regulations.

    Benefits of a first-party data strategy

    First-party data is reliable, accurate, and ethically sourced. It’s an essential part of any modern digital marketing strategy.

    More personalised experiences

    The most important application of first-party data is customising and personalising customers’ interactions based on real behaviours and preferences. Personalised experiences aren’t restricted to websites and can extend to all customer communication.

    The result is company communications and marketing messages are far more relevant to customers. It allows businesses to engage more meaningfully with them, building trust and strengthening customer relationships. Inevitably, this also results in stronger customer loyalty and better customer retention.

    Greater understanding of customers

    Because first-party data is more accurate and reliable, it can be used to derive valuable insights into customer needs and wants. When all the disparate first-party data points are centralised and organised, it’s possible to uncover trends and patterns in customer behaviour that might not be apparent using other data.

    This helps businesses predict and respond to customer needs. It also allows marketing teams to be more deliberate when segmenting customers and prospects into like-minded groups. The data can also be used to create more precise personas for future campaigns or reveal how likely a customer would be to purchase in response to a campaign.

    Build trust with customers

    First-party data is unique to a business and originates from interactions with customers. It’s also data collected with consent and is “owned” by the company — if you can ever own someone else’s data. If treated like the precious resource, it can help businesses build trust with customers.

    However, developing that trust requires a transparent, step-by-step approach. This gradually strengthens relationships to the point where customers are more comfortable sharing the information they’re asked for.

    However, while building trust is a long and sometimes arduous process, it can be lost in an instant. That’s why first-party data must be protected like the Crown Jewels.

    Image showing the five key elements of a first-party data strategy

    Components of a first-party data strategy

    Security is essential to any first-party data strategy, and for good reason. As Gartner puts it, a business must find the optimal balance between business outcomes and data risk mitigation. Once security is baked in, attention can turn to the different aspects of the strategy.

    Data collection

    There are many ways to collect first-party data ethically, within the law and while complying with data privacy regulations, such as Europe’s General Data Protection Regulation (GDPR). Potential sources include :

    Website activityforms and surveys, behavioural tracking, cookies, tracking pixels and chatbots
    Mobile app interactionsin-app analytics, push notifications and in-app forms
    Email marketingnewsletter sign-ups, email engagement tracking, promotions, polls and surveys 
    Eventsregistrations, post-event surveys and virtual event analytics
    Social media interactionpolls and surveys, direct messages and social media analytics
    Previous transactionspurchase history, loyalty programmes and e-receipts 
    Customer service call centre data, live chat, chatbots and feedback forms
    In-person interactions in-store purchases, customer feedback and Wi-Fi sign-ins
    Gated contentwhitepapers, ebooks, podcasts, webinars and video downloads
    Interactive contentquizzes, assessments, calculators and free tools
    CRM platformscustomer profiles and sales data
    Consent managementprivacy policies, consent forms, preference setting

    Consent management

    It may be the final item on the list above, but it’s also a key requirement of many data privacy laws and regulations. For example, the GDPR is very clear about consent : “Processing personal data is generally prohibited, unless it is expressly allowed by law, or the data subject has consented to the processing.”

    For that reason, your first-party data strategy must incorporate various transparent consent mechanisms, such as cookie banners and opt-in forms. Crucially, you must provide customers with a mechanism to manage their preferences and revoke that consent easily if they wish to.

    Data management

    Effective first-party data management, mainly its security and storage, is critical. Most data privacy regimes restrict the transfer of personal data to other jurisdictions and even prohibit it in some instances. Many even specify where residents’ data must be stored.

    Consider this cautionary tale : The single biggest fine levied for data privacy infringement so far was €1.2 billion. The Irish Data Protection Commission imposed a massive fine on Meta for transferring EU users’ data to the US without adequate data protection mechanisms.

    Data security is critical. If first-party data is compromised, it becomes third-party data, and any customer trust developed with the business will evaporate. To add insult to injury, data regulators could come knocking. That’s why the trend is to use encryption and anonymisation techniques alongside standard access controls.

    Once security is assured, the focus is on data management. Many businesses use a Customer Data Platform. This software gathers, combines and manages data from many sources to create a complete and central customer profile. Modern CRM systems can also do that job. AI tools could help find patterns and study them. But the most important thing is to keep databases clean and well-organised to make it easier to use and avoid data silos.

    Data activation

    Once first-party data has been collected and analysed, it needs to be activated, which means a business needs to use it for the intended purpose. This is the implementation phase where a well-constructed first-party strategy pays off. 

    The activation stage is where businesses use the intelligence they gather to :

    • Personalise website and app experiences
    • Adapt marketing campaigns
    • Improve conversion rates
    • Match stated preferences
    • Cater to observed behaviours
    • Customise recommendations based on purchase history
    • Create segmented email campaigns
    • Improve retargeting efforts
    • Develop more impactful content

    Measurement and optimisation

    Because first-party data is collected directly from customers or prospects, it’s far more relevant, reliable, and specific. Your analytics and campaign tracking will be more accurate. This gives you direct and actionable insights into your audience’s behaviour, empowering you to optimise your strategies and achieve better results.

    The same goes for your collection and activation efforts. An advanced web analytics platform like Matomo lets you identify key user behaviour and optimise your tracking. Heatmaps, marketing attribution tools, user behaviour analytics and custom reports allow you to segment audiences for better traction (and collect even more first-party data).

    Image showing the five steps to developing a first-party data strategy

    How to build a first-party data strategy

    There are five important and sequential steps to building a first-party data strategy. But this isn’t a one-time process. It must be revisited regularly as operating and regulatory environments change. There are five steps : 

    1. Audit existing data

    Chances are that customers already freely provide a lot of first-party data in the normal course of business. The first step is to locate this data, and the easiest way to do that is by mapping the customer journey. This identifies all the touchpoints where first-party data might be found.

    1. Define objectives

    Then, it’s time to step back and figure out the goals of the first-party data strategy. Consider what you’re trying to achieve. For example :

    • Reduce churn 
    • Expand an existing loyalty programme
    • Unload excess inventory
    • Improve customer experiences

    Whatever the objectives are, they should be clear and measurable.

    1. Implement tools and technology

    The first two steps point to data gaps. Now, the focus turns to ethical web analytics with a tool like Matomo. 

    To further comply with data privacy regulations, it may also be appropriate to implement a Consent Management Platform (CMP) to help manage preferences and consent choices.

    1. Build trust with transparency

    With the tools in place, it’s time to engage customers. To build trust, keep them informed about how their data is used and remind them of their right to withdraw their consent. 

    Transparency is crucial in such engagement, as outlined in the 7 GDPR principles.

    1. Continuously improve

    Rinse and repeat. The one constant in business and life is change. As things change, they expose weaknesses or flaws in the logic behind systems and processes. That’s why a first-party data strategy needs to be continually reviewed, updated, and revised. It must adapt to changing trends, markets, regulations, etc. 

    Tools that can help

    Looking back at the different types of data, it’s clear that some are harder and more bothersome to get than others. But capturing behaviours and interactions can be easy — especially if you use tools that follow data privacy rules.

    But here’s a tip. Google Analytics 4 isn’t compliant by default, especially not with Europe’s GDPR. It may also struggle to comply with some of the newer data privacy regulations planned by different US states and other countries.

    Matomo Analytics is compliant with the GDPR and many other data privacy regulations worldwide. Because it’s open source, it can be integrated with any consent manager.

    Get started today by trying Matomo for free for 21 days,
    no credit card required.

  • 10 Customer Segments Examples and Their Benefits

    9 mai 2024, par Erin

    Now that companies can segment buyers, the days of mass marketing are behind us. Customer segmentation offers various benefits for marketing, content creation, sales, analytics teams and more. Without customer segmentation, your personalised marketing efforts may fall flat. 

    According to the Twilio 2023 state of personalisation report, 69% of business leaders have increased their investment in personalisation. There’s a key reason for this — customer retention and loyalty directly benefit from personalisation. In fact, 62% of businesses have cited improved customer retention due to personalisation efforts. The numbers don’t lie. 

    Keep reading to learn how customer segments can help you fine-tune your personalised marketing campaigns. This article will give you a better understanding of customer segmentation and real-world customer segment examples. You’ll leave with the knowledge to empower your marketing strategies with effective customer segmentation. 

    What are customer segments ?

    Customer segments are distinct groups of people or organisations with similar characteristics, needs and behaviours. Like different species of plants in a garden, each customer segment has specific needs and care requirements. Customer segments are useful for tailoring personalised marketing campaigns for specific groups.

    Personalised marketing has been shown to have significant benefits — with 56% of consumers saying that a personalised experience would make them become repeat buyers

    Successful marketing teams typically focus on these types of customer segmentation :

    A chart with icons representing the different customer segmentation categories
    1. Geographic segmentation : groups buyers based on their physical location — country, city, region or climate — and language.
    2. Purchase history segmentation : categorises buyers based on their purchasing habits — how often they make purchases — and allows brands to distinguish between frequent, occasional and one-time buyers. 
    3. Product-based segmentation : groups buyers according to the products they prefer or end up purchasing. 
    4. Customer lifecycle segmentation : segments buyers based on where they are in the customer journey. Examples include new, repeat and lapsed buyers. This segmentation category is also useful for understanding the behaviour of loyal buyers and those at risk of churning. 
    5. Technographic segmentation : focuses on buyers’ technology preferences, including device type, browser type, and operating system. 
    6. Channel preference segmentation : helps us understand why buyers prefer to purchase via specific channels — whether online channels, physical stores or a combination of both. 
    7. Value-based segmentation : categorises buyers based on their average purchase value and sensitivity to pricing, for example. This type of segmentation can provide insights into the behaviours of price-conscious buyers and those willing to pay premium prices. 

    Customer segmentation vs. market segmentation

    Customer segmentation and market segmentation are related concepts, but they refer to different aspects of the segmentation process in marketing. 

    Market segmentation is the broader process of dividing the overall market into homogeneous groups. Market segmentation helps marketers identify different groups based on their characteristics or needs. These market segments make it easier for businesses to connect with new buyers by offering relevant products or new features. 

    On the other hand, customer segmentation is used to help you dig deep into the behaviour and preferences of your current customer base. Marketers use customer segmentation insights to create buyer personas. Buyer personas are essential for ensuring your personalised marketing efforts are relevant to the target audience. 

    10 customer segments examples

    Now that you better understand different customer segmentation categories, we’ll provide real-world examples of how customer segmentation can be applied. You’ll be able to draw a direct connection between the segmentation category or categories each example falls under.

    One thing to note is that you’ll want to consider privacy and compliance when you are considering collecting and analysing types of data such as gender, age, income level, profession or personal interests. Instead, you can focus on these privacy-friendly, ethical customer segmentation types :

    1. Geographic location (category : geographic segmentation)

    The North Face is an outdoor apparel and equipment company that relies on geographic segmentation to tailor its products toward buyers in specific regions and climates. 

    For instance, they’ll send targeted advertisements for insulated jackets and snow gear to buyers in colder climates. For folks in seasonal climates, The North Face may send personalised ads for snow gear in winter and ads for hiking or swimming gear in summer. 

    The North Face could also use geographic segmentation to determine buyers’ needs based on location. They can use this information to send targeted ads to specific customer segments during peak ski months to maximise profits.

    2. Preferred language (category : geographic segmentation)

    Your marketing approach will likely differ based on where your customers are and the language they speak. So, with that in mind, language may be another crucial variable you can introduce when identifying your target customers. 

    Language-based segmentation becomes even more important when one of your main business objectives is to expand into new markets and target international customers — especially now that global reach is made possible through digital channels. 

    Coca-Cola’s “Share a Coke” is a multi-national campaign with personalised cans and bottles featuring popular names from countries around the globe. It’s just one example of targeting customers based on language.

    3. Repeat users and loyal customers (category : customer lifecycle segmentation)

    Sephora, a large beauty supply company, is well-known for its Beauty Insider loyalty program. 

    It segments customers based on their purchase history and preferences and rewards their loyalty with gifts, discounts, exclusive offers and free samples. And since customers receive personalised product recommendations and other perks, it incentivises them to remain members of the Beauty Insider program — adding a boost to customer loyalty.

    By creating a memorable customer experience for this segment of their customer base, staying on top of beauty trends and listening to feedback, Sephora is able to keep buyers coming back.

    All customers on the left and their respective segments on the right

    4. New customers (category : customer lifecycle segmentation)

    Subscription services use customer lifecycle segmentation to offer special promotions and trials for new customers. 

    HBO Max is a great example of a real company that excels at this strategy : 

    They offer 40% savings on an annual ad-free plan, which targets new customers who may be apprehensive about the added monthly cost of a recurring subscription.

    This marketing strategy prioritises fostering long-term customer relationships with new buyers to avoid high churn rates. 

    5. Cart abandonment (category : purchase history segmentation)

    With a rate of 85% among US-based mobile users, cart abandonment is a huge issue for ecommerce businesses. One way to deal with this is to segment inactive customers and cart abandoners — those who showed interest by adding products to their cart but haven’t converted yet — and send targeted emails to remind them about their abandoned carts.

    E-commerce companies like Ipsy, for example, track users who have added items to their cart but haven’t followed through on the purchase. The company’s messaging often contains incentives — like free shipping or a limited-time discount — to encourage passive users to return to their carts. 

    Research has found that cart abandonment emails with a coupon code have a high 44.37% average open rate. 

    6. Website activity (category : technographic segmentation)

    It’s also possible to segment customers based on website activity. Now, keep in mind that this is a relatively broad approach ; it covers every interaction that may occur while the customer is browsing your website. As such, it leaves room for many different types of segmentation. 

    For instance, you can segment your audience based on the pages they visited, the elements they interacted with — like CTAs and forms — how long they stayed on each page and whether they added products to their cart. 

    Matomo’s Event Tracking can provide additional context to each website visit and tell you more about the specific interactions that occur, making it particularly useful for segmenting customers based on how they spend their time on your website. 

    Try Matomo for Free

    Get the web insights you need, while respecting user privacy.

    No credit card required

    Amazon segments its customers based on browsing behaviour — recently viewed products and categories, among other things — which, in turn, allows them to improve the customer’s experience and drive sales.

    7. Traffic source (category : channel segmentation) 

    You can also segment your audience based on traffic sources. For example, you can determine if your website visitors arrived through Google and other search engines, email newsletters, social media platforms or referrals. 

    In other words, you’ll create specific audience segments based on the original source. Matomo’s Acquisition feature can provide insights into five different types of traffic sources — search engines, social media, external websites, direct traffic and campaigns — to help you understand how users enter your website.

    You may find that most visitors arrive at your website through social media ads or predominantly discover your brand through search engines. Either way, by learning where they’re coming from, you’ll be able to determine which conversion paths you should prioritise and optimise further. 

    8. Device type (category : technographic segmentation)

    Device type is customer segmentation based on the devices that potential customers may use to access your website and view your content. 

    It’s worth noting that, on a global level, most people (96%) use mobile devices — primarily smartphones — for internet access. So, there’s a high chance that most of your website visitors are coming from mobile devices, too. 

    However, it’s best not to assume anything. Matomo can detect the operating system and the type of device — desktop, mobile device, tablet, console or TV, for example. 

    By introducing the device type variable into your customer segmentation efforts, you’ll be able to determine if there’s a preference for mobile or desktop devices. In return, you’ll have a better idea of how to optimise your website — and whether you should consider developing an app to meet the needs of mobile users.

    Try Matomo for Free

    Get the web insights you need, while respecting user privacy.

    No credit card required

    9. Browser type (category : technographic segmentation)

    Besides devices, another type of segmentation that belongs to the technographic category and can provide valuable insights is browser-related. In this case, you’re tracking the internet browser your customers use. 

    Many browser types are available — including Google Chrome, Microsoft Edge, Safari, Firefox and Brave — and each may display your website and other content differently. 

    So, keeping track of your customers’ preferred choices is important. Otherwise, you won’t be able to fully understand their online experience — or ensure that these browsers are displaying your content properly. 

    Browser type in Matomo

    10. Ecommerce activity (category : purchase history, value based, channel or product based segmentation) 

    Similar to website activity, looking at ecommerce activity can tell your sales teams more about which pages the customer has seen and how they have interacted with them. 

    With Matomo’s Ecommerce Tracking, you’ll be able to keep an eye on customers’ on-site behaviours, conversion rates, cart abandonment, purchased products and transaction data — including total revenue and average order value.

    Considering that the focus is on sales channels — such as your online store — this approach to customer segmentation can help you improve the sales experience and increase profitability. 

    Start implementing these customer segments examples

    With ever-evolving demographics and rapid technological advancements, customer segmentation is increasingly complex. The tips and real-world examples in this article break down and simplify customer segmentation so that you can adapt to your customer base. 

    Customer segmentation lays the groundwork for your personalised marketing campaigns to take off. By understanding your users better, you can effectively tailor each campaign to different segments. 

    If you’re ready to see how Matomo can elevate your personalised marketing campaigns, try it for free for 21 days. No credit card required.

  • FFmpeg Could not write header (incorrect codec parameters ?) : Invalid data found when processing input [closed]

    14 juillet 2024, par cookie

    The command

    


    ffmpeg -v verbose -i in.mkv -c copy -y out.mkv


    


    produces the following error :

    


    ffmpeg version 7.0.1-full_build-www.gyan.dev Copyright (c) 2000-2024 the FFmpeg developers
  built with gcc 13.2.0 (Rev5, 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-bzlib --enable-lzma --enable-libsnappy --enable-zlib --enable-librist --enable-libsrt --enable-libssh --enable-libzmq --enable-avisynth --enable-libbluray --enable-libcaca --enable-sdl2 --enable-libaribb24 --enable-libaribcaption --enable-libdav1d --enable-libdavs2 --enable-libuavs3d --enable-libxevd --enable-libzvbi --enable-librav1e --enable-libsvtav1 --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs2 --enable-libxeve --enable-libxvid --enable-libaom --enable-libjxl --enable-libopenjpeg --enable-libvpx --enable-mediafoundation --enable-libass --enable-frei0r --enable-libfreetype --enable-libfribidi --enable-libharfbuzz --enable-liblensfun --enable-libvidstab --enable-libvmaf --enable-libzimg --enable-amf --enable-cuda-llvm --enable-cuvid --enable-dxva2 --enable-d3d11va --enable-d3d12va --enable-ffnvcodec --enable-libvpl --enable-nvdec --enable-nvenc --enable-vaapi --enable-libshaderc --enable-vulkan --enable-libplacebo --enable-opencl --enable-libcdio --enable-libgme --enable-libmodplug --enable-libopenmpt --enable-libopencore-amrwb --enable-libmp3lame --enable-libshine --enable-libtheora --enable-libtwolame --enable-libvo-amrwbenc --enable-libcodec2 --enable-libilbc --enable-libgsm --enable-libopencore-amrnb --enable-libopus --enable-libspeex --enable-libvorbis --enable-ladspa --enable-libbs2b --enable-libflite --enable-libmysofa --enable-librubberband --enable-libsoxr --enable-chromaprint
  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
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  libswscale      8.  1.100 /  8.  1.100
  libswresample   5.  1.100 /  5.  1.100
  libpostproc    58.  1.100 / 58.  1.100
[hevc @ 00000133b5bb5040] Invalid default display window
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        _STATISTICS_WRITING_DATE_UTC: 2015-03-20 14:07:27
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        NUMBER_OF_BYTES-eng: 681234123
  Stream #0:1(jpn): Audio: flac, 48000 Hz, stereo, s32 (24 bit) (default)
      Metadata:
        _STATISTICS_WRITING_APP: mkvmerge v7.0.0 ('Where We Going') 32bit built on Jun  9 2014 15:08:34
        _STATISTICS_WRITING_APP-eng: mkvmerge v7.0.0 ('Where We Going') 32bit built on Jun  9 2014 15:08:34
        _STATISTICS_WRITING_DATE_UTC: 2015-03-20 14:07:27
        _STATISTICS_WRITING_DATE_UTC-eng: 2015-03-20 14:07:27
        _STATISTICS_TAGS: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
        _STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
        BPS             : 1429414
        BPS-eng         : 1429414
        DURATION        : 00:24:11.745000000
        DURATION-eng    : 00:24:11.745000000
        NUMBER_OF_FRAMES: 17013
        NUMBER_OF_FRAMES-eng: 17013
        NUMBER_OF_BYTES : 259393130
        NUMBER_OF_BYTES-eng: 259393130
[out#0/matroska @ 00000133b5bb5a40] No explicit maps, mapping streams automatically...
[vost#0:0/copy @ 00000133b5c2f580] Created video stream from input stream 0:0
[aost#0:1/copy @ 00000133b5bf1680] Created audio stream from input stream 0:1
Stream mapping:
  Stream #0:0 -> #0:0 (copy)
  Stream #0:1 -> #0:1 (copy)
[out#0/matroska @ 00000133b5bb5a40] Could not write header (incorrect codec parameters ?): Invalid data found when processing input
[AVIOContext @ 00000133b5c27940] Statistics: 291 bytes written, 0 seeks, 1 writeouts
[AVIOContext @ 00000133b5b97980] Statistics: 66432 bytes read, 2 seeks
Conversion failed!


    


    Originally, I was trying to add a subtitle to in.mkv, but I keep encountering this error. When I add the subtitle to another MKV file, it works fine, so I believe the problem lies with in.mkv.

    


    Troubleshooting

    


    Output only video stream produce the same error :

    


    ffmpeg -i in.mkv -map 0:v:0 -c copy out.mkv


    


    Output only audio stream works fine :

    


    ffmpeg -i in.mkv -map 0:a:0 -c copy out.mkv


    


    Output as mp4 got no error, but the output file is unplayable :

    


    ffmpeg -i in.mkv -c copy -strict -2 out.mp4


    


    Re-encoding works fine :

    


    ffmpeg -i in.mkv -c:v libx265 -c:a copy out.mkv


    


    How can I fix the video stream in in.mkv so that I can add a subtitle stream and remux the file without re-encoding the video ? Any insights or suggestions on handling this error would be greatly appreciated.