pyfedi/app/templates/post/post_teaser/_video.html

<div class="col post_teaser_body">
    <h3>{% if post.sticky -%}<span class="fe fe-sticky-left"></span>{% endif -%}<a href="{{ url_for('activitypub.post_ap', post_id=post.id, sort='new' if sort == 'active' else None) }}" class="post_teaser_title_a">{{ post.title }}</a>
        {% if  post.domain_id -%}
            {% if post.url and 'youtube.com' in post.url -%}
                <span class="fe fe-video" aria-hidden="true"></span>
            {% elif post.url.endswith('.mp3') -%}
                <span class="fe fe-audio" aria-hidden="true"></span>
            {% endif -%}
            <span class="domain_link" aria-hidden="true">(<a href="/d/{{ post.domain_id }}" aria-label="{{ _('All posts about this domain') }}">{{ post.domain.name }}</a>)</span>
        {% endif -%}
        {% if post.nsfw -%}<span class="warning_badge nsfw" title="{{ _('Not safe for work') }}">nsfw</span>{% endif -%}
        {% if post.nsfl -%}<span class="warning_badge nsfl" title="{{ _('Potentially emotionally scarring content') }}">nsfl</span>{% endif -%}
        {% if post.reports > 0 and current_user.is_authenticated and post.community.is_moderator(current_user) -%}
            <span class="red fe fe-report" title="{{ _('Reported. Check post for issues.') }}"></span>
        {% endif -%}
        {% if post.sticky -%}<span class="fe fe-sticky-right"></span>{% endif -%}
    </h3>
    <span class="author small">{% if show_post_community -%}<a href="/c/{{ post.community.link() }}" aria-label="{{ _('Go to community %(name)s', name=post.community.name) }}">
        {% if post.community.icon_id and not low_bandwidth %}<img class="community_icon_small rounded-circle" src="{{ post.community.icon_image('tiny') }}" alt="Community icon" />{% endif -%}
        c/{{ post.community.name }}</a>{% endif -%}
        by {{ render_username(post.author) }} <time datetime="{{ post.last_active }}">{{ post.posted_at_localized(sort, locale) }}</time></span>
    {% if not low_bandwidth %}
        <div class="post_teaser_video_preview">
            <div class="max_width_512">
                {% if post.url.endswith('.mp4') or post.url.endswith('.webm') -%}
                    <p>
                        <video class="responsive-video" controls preload="{{ 'none' if low_bandwidth else 'auto' }}" {{ 'autoplay muted' if autoplay }} {{ 'loop' if post.community.loop_videos() }}>
                        {% if post.url.endswith('.mp4') -%}
                            <source src="{{ post.url }}" type="video/mp4" />
                        {% elif post.url.endswith('.webm') -%}
                            <source src="{{ post.url }}" type="video/webm" />
                        {% endif -%}
                        </video></p>
                {% elif post.url.startswith('https://streamable.com') -%}
                    <div style="padding-bottom: 56.25%; position: relative;"><iframe loading="lazy" style="position: absolute; top: 0px; left: 0px; width: 100%; height: 100%;" src="{{ post.url.replace('streamable.com/', 'streamable.com/e/') }}" allow="accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture; fullscreen"  width="100%" height="100%" frameborder="0"></iframe></div>
                {% elif post.url.startswith('https://www.redgifs.com/watch/') -%}
                    <div style="padding-bottom: 56.25%; position: relative;"><iframe loading="lazy" style="position: absolute; top: 0px; left: 0px; width: 100%; height: 100%;" src="{{ post.url.replace('redgifs.com/watch/', 'redgifs.com/ifr/') }}" allow="accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture; fullscreen"  width="100%" height="100%" frameborder="0"></iframe></div>
                {% endif -%}
                {% if 'youtube.com' in post.url -%}
                    <div class="video-wrapper" data-src="https://www.youtube.com/embed/{{ post.youtube_embed() }}">
                        <a href="{{ url_for('activitypub.post_ap', post_id=post.id, sort='new' if sort == 'active' else None, autoplay='true') }}" rel="nofollow ugc" aria-label="{{ _('Read article') }}">
                            <img src="https://img.youtube.com/vi/{{ post.youtube_embed(rel=False).replace('v=', '').replace('?', '') }}/hqdefault.jpg" alt="Video Thumbnail" width="512" height="288" loading="lazy">
                        </a>
                    </div>
                {% endif -%}
                {% if 'videos/watch' in post.url -%}
                    <div style="padding-bottom: 56.25%; position: relative;"><iframe loading="lazy" style="position: absolute; top: 0px; left: 0px; width: 100%; height: 100%;" src="{{ post.peertube_embed() }}" allow="accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture; fullscreen"  width="100%" height="100%" frameborder="0"></iframe></div>
                {% endif -%}
            </div>
        </div>
    {% endif -%}
    {% include "post/post_teaser/_utilities_bar.html" %}
</div>