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<h1 id="dev_page_title">Encoding Video Stickers with .WEBM and VP9</h1>
<div id="dev_page_content"><p>The <a href="https://telegram.org/blog/video-stickers-better-reactions">Video Sticker</a> format allows anyone to easily create <strong>high-detail animations</strong> that users can send and share instantly in Telegram.</p>
<h3><a class="anchor" name="video-sticker-requirements" href="#video-sticker-requirements"><i class="anchor-icon"></i></a>Video Sticker Requirements</h3>
<ul>
<li>Video must be in <strong>.WEBM</strong> format, up to <strong>30 FPS</strong>.</li>
<li>Video must be encoded with the <strong>VP9 codec</strong>.</li>
<li>Video must have <strong>no audio stream</strong>.</li>
<li>One side must be <strong>512 pixels</strong> in size – the other side can be 512 pixels <strong>or less</strong>.</li>
<li>Duration must not exceed <strong>3 seconds</strong>.</li>
<li>Video must have a <strong>transparent layer</strong> (this is a temporary requirement).</li>
<li>Video should be looped for optimal user experience.</li>
<li>Video size should not exceed <strong>256 KB</strong> after encoding. </li>
</ul>
<h3><a class="anchor" name="encoding-video-files" href="#encoding-video-files"><i class="anchor-icon"></i></a>Encoding Video Files</h3>
<p>You can design your animation in your <strong>preferred app</strong> – but depending on the app’s export settings, you may need an <strong>encoding program</strong> to create the final file.</p>
<blockquote>
<p>Programs like <a href="https://www.ffmpeg.org/download.html">ffmpeg</a> natively support .WEBM encoding with VP9 and <strong>alpha channels</strong>.</p>
<p>The alpha channel requirement will be removed in a <strong>coming update</strong> – allowing users to encode their .WEBM files in <a href="https://handbrake.fr/downloads.php">Handbrake</a>.</p>
</blockquote>
<h4><a class="anchor" name="encoding-with-adobe-media-encoder" href="#encoding-with-adobe-media-encoder"><i class="anchor-icon"></i></a>Encoding with Adobe Media Encoder</h4>
<p>Adobe’s Media Encoder <strong>requires a plug-in</strong> to support .WEBM encoding. Here is a modified version of a plug-in by <a href="https://github.com/fnordware/AdobeWebM">fnord software</a> that you can install to render your video stickers with Media Encoder.</p>
<ul>
<li><p><a href="/file/464001139/fd54/udyaRyjzBQ0.837957.zip/cd1e72526a65d383e5">Windows WEBM plug-in</a><br>Windows Installation Path<br><code>C:\Program Files\Adobe\Common\Plug-ins\7.0\MediaCore</code></p>
</li>
<li><p><a href="/file/464001958/101cc/d7q2KrY6DDU.1628141.zip/15bbe083289d292ce6">macOS WEBM plug-in (M1 and Intel)</a><br>macOS Installation Path:<br><code>~/Library/Application Support/Adobe/Common/Plug-ins/7.0/MediaCore</code></p>
</li>
</ul>
<p>After the plug-in is installed, .WEBM will appear in the list of formats in the Queue tab.</p>
<blockquote>
<p>On macOS, you may need to go to Settings &gt; Security &amp; Privacy to approve installation.</p>
</blockquote>
<h4><a class="anchor" name="render-settings" href="#render-settings"><i class="anchor-icon"></i></a>Render Settings</h4>
<p>If it’s your first time working with encoding software, here are some tips that might help:</p>
<ul>
<li>Make sure to check that <strong>VP9</strong> is selected in the codec settings – some apps may default to VP8.</li>
<li>Make sure to <strong>remove</strong> any audio streams (uncheck ‘Export Audio’ in Adobe programs).</li>
<li>Make sure the frame rate is a <strong>constant 30 FPS</strong>.</li>
<li>Use <strong>Constant Quality</strong> and a lower (or lowest) quality setting – size dramatically decreases without affecting fidelity.</li>
<li>In <strong>Media Encoder</strong>, make sure your Renderer is set to ‘Software Only’.</li>
<li>If your file fails to render, try importing it as a <strong>PNG Sequence</strong>.</li>
</ul>
<blockquote>
<p>After Effects projects integrate directly with Media Encoder via <em>File &gt; Export &gt; Add to Media Encoder Queue</em>.</p>
</blockquote>
<h3><a class="anchor" name="uploading-video-stickers" href="#uploading-video-stickers"><i class="anchor-icon"></i></a>Uploading Video Stickers</h3>
<p>The <a href="https://t.me/Stickers">@Stickers</a> bot lets you quickly <strong>publish</strong> and <strong>manage</strong> your sticker packs. Start a chat with it on Telegram and it will walk you through the process. For <strong>step-by-step instructions</strong> and more information, see <a href="https://core.telegram.org/stickers#using-the-stickers-bot">this guide</a>.</p>
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<div class="side_blog_date">Jan 31</div>
<div class="side_blog_title">Video Stickers, Better Reactions and More</div>
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<h1 id="dev_page_title">Crowdsourcing a More Secure Future</h1>
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<p>A few days ago we launched a <a href="http://telegram.org/crypto_contest"><strong>contest</strong></a> to improve Telegram&#39;s security and are delighted to already have the first results. A <a href="http://habrahabr.ru">Russian IT-community</a> user identified a potentially vulnerable spot in our secret chat implementation. While this would not help him decipher the traffic and win <a href="http://telegram.org/crypto_contest">the contest</a>, his achievement deserves a notice — and a big prize.</p>
<blockquote>
<p>The habrahabr user <a href="http://habrahabr.ru/users/x7mz/">x7mz</a> had discovered that in case the Telegram server could be seized by a malicious third party, it could send different nonce numbers to each of the clients participating in a secret chat.</p>
<p>These nonce numbers were introduced to add more randomness to the secret chat keys, mostly because of possible undiscovered vulnerabilities of the random generators on mobile devices (for example, one such vulnerability was found this August in <a href="http://android-developers.blogspot.ru/2013/08/some-securerandom-thoughts.html">android phones</a>).</p>
<p>As was pointed out, this solution would have also made it possible for the visual representations of the shared secret key to be identical in case of a man-in-the-middle attack — provided such attack was done by the seized server. Obviously, the server has been under Telegram&#39;s control all this time, so this theoretical threat never had a chance to come to life.</p>
</blockquote>
<p>The developer who found the potential weakness has earned a reward of <strong>$100,000</strong>. We have contacted him to find out how he would like to collect his prize.</p>
<p>A similar reward awaits anyone who finds viable ways of compromising <a href="https://core.telegram.org/mtproto">MTProto’s</a> security (and there is an outstanding reward of $200,000 for <a href="http://telegram.org/crypto_contest">deciphering Telegram traffic</a>). All submissions to <strong>security@telegram.org</strong> which result in a change of code or configuration are eligible for bounties, ranging from <strong>$500</strong> to <strong>$100,000</strong> or more, depending on the severity of the issue.</p>
<p>This story showcases the importance of keeping the <a href="https://core.telegram.org/mtproto">protocol specification</a> and <a href="http://telegram.org/source">source code</a> open — this way thousands of bright minds from all over the world can help us find potential vulnerabilities and improve the protocol.</p>
<p>Let’s keep on looking for any weak spots. Together we can make Telegram unbreakable.</p>
<p>December 21, 2013<br><em>The Telegram Team</em></p>
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<h4 class="dev_blog_card_title">Video Stickers, Better Reactions and More</h4>
<div class="dev_blog_card_lead">This update brings easy-to-make video stickers, better reactions with more compact animations and extra emoji, a button to review unseen…</div>
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<div class="dev_blog_card_date">Jan 31, 2022</div>
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<h4 class="dev_blog_card_title">Reactions, Spoilers, Translation and QR Codes</h4>
<div class="dev_blog_card_lead">Telegram&#39;s 12th update of the year introduces reactions, message translation, themed QR codes, hidden text (spoilers), and more.</div>
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<div class="dev_blog_card_date">Dec 30, 2021</div>
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<h4 class="dev_blog_card_title">Protected Content, Delete by Date, Device Management and More</h4>
<div class="dev_blog_card_lead">Today&#39;s update brings tools to prevent others from saving content from groups and channels, the ability to delete messages for specific…</div>
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<div class="dev_blog_card_date">Dec 7, 2021</div>
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<h4 class="dev_blog_card_title">Hyper-Speed Scrolling and Calendar View for Shared Media, Join Requests, Global Chat Themes on iOS and More</h4>
<div class="dev_blog_card_lead">Today&#39;s update brings new ways to find memories in shared media with accelerated scrolling…</div>
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<div class="dev_blog_card_date">Nov 3, 2021</div>
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<div class="side_blog_date">Jan 31</div>
<div class="side_blog_title">Video Stickers, Better Reactions and More</div>
</a><a href="/blog/reactions-spoilers-translations" class="side_blog_entry">
<div class="side_blog_date">Dec 30</div>
<div class="side_blog_title">Reactions, Spoilers, Translation and QR Codes</div>
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<h1 id="dev_page_title">Better Replies, Stickers &amp; Invitations</h1>
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<a href="/file/811140590/1547/niq2wel17XA.859597/998b01a68cd20d3abb" target="_blank"><img src="/file/811140963/15b3/-e2Y4AFQTEQ.192689/1d6f971205bebff61d" title="New mention and reply alerts. Click for full-res image."/></a>
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<p>Since 2015 when we first introduced <a href="https://telegram.org/blog/replies-mentions-hashtags">replies</a>, the maximum group size on Telegram has increased by 100 times – from 200 max members to <strong>20,000</strong>. These days you can get new mentions or replies in group chats many times during a day – and it’s important not to miss those messages.</p>
<p>Starting with Telegram 4.3, whenever somebody replies to you or mentions you in a group, you’ll notice this straight away by the <strong>‘@’</strong> badge in the chats list:</p>
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<p>If you have new replies/mentions in a group, you can now instantly reach them by tapping the new <strong>‘@’</strong> button when inside the chat. This button will disappear once you’ve read all the relevant messages.</p>
<h4><a class="anchor" name="favorite-stickers" href="#favorite-stickers"><i class="anchor-icon"></i></a>Favorite Stickers</h4>
<p>Anyone can create and upload stickers on Telegram. As a result, thousands of new stickers are added to the platform each day, and some of us have dozens of sticker sets installed.</p>
<p>Starting today, anyone with five or more sticker sets installed can mark individual stickers as ‘favorites’, and have them always accessible at the top of the sticker panel in the ‘star’ section. </p>
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<h4><a class="anchor" name="stickers-of-the-group" href="#stickers-of-the-group"><i class="anchor-icon"></i></a>Stickers of the Group</h4>
<p>Speaking of stickers, large groups with 100 members and more can now choose an official sticker set for all the members of the group to see and use while they&#39;re chatting in the group — without the need of adding it to their panels.</p>
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<p>Group Stickers</p>
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<h4><a class="anchor" name="invite-friends" href="#invite-friends"><i class="anchor-icon"></i></a>Invite Friends</h4>
<p>The ‘Invite Friends’ section (accessible from Contacts) has been completely redesigned. Your contacts that are not on Telegram yet but have many of their friends already using it are now listed at the top. If you invite any of them to join, they’ll be welcomed by tens of Telegram veterans among their contacts:</p>
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<p>Invite Friends to Telegram</p>
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<h4><a class="anchor" name="and-more" href="#and-more"><i class="anchor-icon"></i></a>…And More</h4>
<p>As always with new releases, we&#39;ve included several small goodies you may also like:</p>
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<li>Twitch videos are now supported in the Telegram in-app player, so you can watch Twitch streams in Picture-in-Picture mode while chatting with your friends.</li>
<li>When on a Telegram voice call, you can now check the signal strength thanks to the new indicator. </li>
<li>On iOS, you can edit any photo you pasted directly to a chat from clipboard before sending.</li>
<li>On Android, when forwarding a message, you can long tap to select multiple recipients. </li>
<li>On Android, when viewing photos in Shared Media, you can go to the place in chat where the photo was posted. </li>
<li>On Android, if you have many new messages in many active chats, synchronization will happen much, much faster. </li>
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<p>Summer is over. Stay tuned, another update is already brewing in our dungeons! </p>
<p><em>September 3, 2017<br>The Telegram Team</em></p>
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<h4 class="dev_blog_card_title">Video Stickers, Better Reactions and More</h4>
<div class="dev_blog_card_lead">This update brings easy-to-make video stickers, better reactions with more compact animations and extra emoji, a button to review unseen…</div>
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<div class="dev_blog_card_date">Jan 31, 2022</div>
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<h4 class="dev_blog_card_title">Reactions, Spoilers, Translation and QR Codes</h4>
<div class="dev_blog_card_lead">Telegram&#39;s 12th update of the year introduces reactions, message translation, themed QR codes, hidden text (spoilers), and more.</div>
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<div class="dev_blog_card_date">Dec 30, 2021</div>
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<h4 class="dev_blog_card_title">Protected Content, Delete by Date, Device Management and More</h4>
<div class="dev_blog_card_lead">Today&#39;s update brings tools to prevent others from saving content from groups and channels, the ability to delete messages for specific…</div>
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<div class="dev_blog_card_date">Dec 7, 2021</div>
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<div class="dev_blog_card_lead">Today&#39;s update brings new ways to find memories in shared media with accelerated scrolling…</div>
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