<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto">Hi Will<div><br></div><div>Yes the videorate can do what you want. Set the “rate” property to 2.0</div><div><br></div><div>Videorate serves two purposes:</div><div>1. control the framerate but maintain the playback speed (most documented usage)</div><div>2. vary the playback speed (using the rate property)</div><div><br></div><div>If you want more flexibility than videorate can offer you will need to send a seek event. This allows you to, not only to increase/decrease the speed, but also to start from a certain point, go backwards and many other trick modes.</div><div><br></div><div><div style="display: block;" class=""><div style="display: block;" class=""><div style="-webkit-user-select: all; -webkit-user-drag: element; display: inline-block;" class="apple-rich-link" draggable="true" role="link" data-url="https://gstreamer.freedesktop.org/documentation/additional/design/trickmodes.html?gi-language=c#client-side-backwards-trickmode"><a style="border-radius:10px;font-family:-apple-system, Helvetica, Arial, sans-serif;display:block;-webkit-user-select:none;width:300px;user-select:none;-webkit-user-modify:read-only;user-modify:read-only;overflow:hidden;text-decoration:none;" class="lp-rich-link" rel="nofollow" href="https://gstreamer.freedesktop.org/documentation/additional/design/trickmodes.html?gi-language=c#client-side-backwards-trickmode" dir="ltr" role="button" draggable="false" width="300"><table style="table-layout:fixed;border-collapse:collapse;width:300px;background-color:#E9E9EB;font-family:-apple-system, Helvetica, Arial, sans-serif;" class="lp-rich-link-emailBaseTable" cellpadding="0" cellspacing="0" border="0" width="300"><tbody><tr><td vertical-align="center"><table bgcolor="#E9E9EB" cellpadding="0" cellspacing="0" width="300" style="font-family:-apple-system, Helvetica, Arial, sans-serif;table-layout:fixed;background-color:rgba(233, 233, 235, 1);" class="lp-rich-link-captionBar"><tbody><tr><td style="padding:8px 0px 8px 0px;" class="lp-rich-link-captionBar-textStackItem"><div style="max-width:100%;margin:0px 16px 0px 16px;overflow:hidden;" class="lp-rich-link-captionBar-textStack"><div style="word-wrap:break-word;font-weight:500;font-size:12px;overflow:hidden;text-overflow:ellipsis;text-align:left;" class="lp-rich-link-captionBar-textStack-topCaption-leading"><a rel="nofollow" href="https://gstreamer.freedesktop.org/documentation/additional/design/trickmodes.html?gi-language=c#client-side-backwards-trickmode" style="text-decoration: none" draggable="false"><font color="#000000" style="color: rgba(0, 0, 0, 1);">Trickmodes</font></a></div><div style="word-wrap:break-word;font-weight:400;font-size:11px;overflow:hidden;text-overflow:ellipsis;text-align:left;" class="lp-rich-link-captionBar-textStack-bottomCaption-leading"><a rel="nofollow" href="https://gstreamer.freedesktop.org/documentation/additional/design/trickmodes.html?gi-language=c#client-side-backwards-trickmode" style="text-decoration: none" draggable="false"><font color="#A2A2A9" style="color: rgba(60, 60, 67, 0.6);">gstreamer.freedesktop.org</font></a></div></div></td><td style="padding:6px 12px 6px 0px;" class="lp-rich-link-captionBar-rightIconItem" width="36"><a rel="nofollow" href="https://gstreamer.freedesktop.org/documentation/additional/design/trickmodes.html?gi-language=c#client-side-backwards-trickmode" draggable="false"><img style="pointer-events:none !important;display:inline-block;width:36px;height:36px;border-radius:3px;" width="36" height="36" draggable="false" class="lp-rich-link-captionBar-rightIcon" alt="favicon-180.png" src="cid:632EB708-CC23-4A2B-AD47-E0BC061BFB96"></a></td></tr></tbody></table></td></tr></tbody></table></a></div></div><br></div></div><div><br></div><div><div dir="ltr">Michael</div><div dir="ltr"><br><blockquote type="cite">On 5 Oct 2023, at 07:57, Will McElderry via gstreamer-devel <gstreamer-devel@lists.freedesktop.org> wrote:<br><br></blockquote></div><blockquote type="cite"><div dir="ltr"><span>Hi All,</span><br><span></span><br><span></span><br><span>I'm wondering if there is a way to change the playback display period rate of an input stream.</span><br><span></span><br><span></span><br><span>For example, I'd like to convert:</span><br><span></span><br><span> file1.mp4 with 1000 frames, plays back @10 fps = 100 seconds long</span><br><span></span><br><span>Into</span><br><span></span><br><span> file1_fast.mp4 with 1000 frames, plays back @20 fps = 50 seconds long</span><br><span></span><br><span></span><br><span>I can do it with ffmpeg in various ways as detailed here:</span><br><span></span><br><span>https://trac.ffmpeg.org/wiki/How%20to%20speed%20up%20/%20slow%20down%20a%20video</span><br><span></span><br><span>Are there any simple pipelines elements that can do that?</span><br><span></span><br><span></span><br><span>(NB: I believe the videorate plugin does not do what I want. Please flag if you know otherwise!)</span><br><span></span><br><span></span><br><span>Thanks!</span><br><span></span><br><span></span><br><span>Will.</span><br><span></span><br><span></span><br></div></blockquote></div></body></html>