<div style="font-family: Arial; font-size: 14px; color: rgb(0, 0, 0);">Hii all</div><div style="font-family: Arial; font-size: 14px; color: rgb(0, 0, 0);">I'm creating an audio player using Playbin of Gstreamer and GTK (www.gtk.org). The player perfectly plays M4B files but I'm not getting any GstMessage of type Gst.MessageType.TOC. I tested using both files from internet and manually converting an MP3 to M4B, it doesn't work. <br></div><div style="font-family: Arial; font-size: 14px; color: rgb(0, 0, 0);">However Celluloid (<span><a target="_blank" rel="noreferrer nofollow noopener" href="https://github.com/celluloid-player/celluloid">https://github.com/celluloid-player/celluloid</a></span>) is able to display the ToC. I have attached the link to an MWE of the player and a sample M4B file (*).</div><div style="font-family: Arial; font-size: 14px; color: rgb(0, 0, 0);"><br></div><div style="font-family: Arial; font-size: 14px; color: rgb(0, 0, 0);">The GStreamer related packages in my system:</div><div style="font-family: Arial; font-size: 14px; color: rgb(0, 0, 0);"><span>$ apt list --installed | grep 'gst'</span></div><div style="font-family: Arial; font-size: 14px; color: rgb(0, 0, 0);"><span>gir1.2-gst-plugins-base-1.0/testing,now 1.20.3-2 amd64 [installed,automatic]</span><div><span>gir1.2-gstreamer-1.0/testing,now 1.20.3-1 amd64 [installed,automatic]</span></div><div><span>gstreamer1.0-gl/testing,now 1.20.3-2 amd64 [installed,automatic]</span></div><div><span>gstreamer1.0-gtk3/testing,now 1.20.3-1+b1 amd64 [installed,automatic]</span></div><div><span>gstreamer1.0-libav/testing,now 1.20.3-1+b1 amd64 [installed,automatic]</span></div><div><span>gstreamer1.0-packagekit/testing,now 1.2.5-3+b1 amd64 [installed]</span></div><div><span>gstreamer1.0-pipewire/testing,now 0.3.59-1+b1 amd64 [installed,automatic]</span></div><div><span>gstreamer1.0-plugins-bad/testing,now 1.20.3-2+b1 amd64 [installed,automatic]</span></div><div><span>gstreamer1.0-plugins-base/testing,now 1.20.3-2 amd64 [installed]</span></div><div><span>gstreamer1.0-plugins-good/testing,now 1.20.3-1+b1 amd64 [installed]</span></div><div><span>gstreamer1.0-x/testing,now 1.20.3-2 amd64 [installed,automatic]</span></div><div><span>libgstreamer-gl1.0-0/testing,now 1.20.3-2 amd64 [installed,automatic]</span></div><div><span>libgstreamer-plugins-bad1.0-0/testing,now 1.20.3-2+b1 amd64 [installed,automatic]</span></div><div><span>libgstreamer-plugins-base1.0-0/testing,now 1.20.3-2 amd64 [installed,automatic]</span></div><div><span>libgstreamer1.0-0/testing,now 1.20.3-1 amd64 [installed,automatic]</span></div><span></span><br></div><div style="font-family: Arial; font-size: 14px; color: rgb(0, 0, 0);"><span><span>Links:</span></span></div><div style="font-family: Arial; font-size: 14px; color: rgb(0, 0, 0);"><ol><li><span><span>Player - <span><a target="_blank" rel="noreferrer nofollow noopener" href="https://paste.debian.net/hidden/f19efd69">https://paste.debian.net/hidden/f19efd69</a></span></span></span></li><li><span><span><span>Audio - <span><a target="_blank" rel="noreferrer nofollow noopener" href="https://upload.disroot.org/r/WSto0jz2#4eg8eiA6OJq3ZjeJ6+oE4YVzYNSC6tTWfNM7Nepto1M=">https://upload.disroot.org/r/WSto0jz2#4eg8eiA6OJq3ZjeJ6+oE4YVzYNSC6tTWfNM7Nepto1M=</a></span><br></span></span></span></li></ol></div><div style="font-family: Arial; font-size: 14px; color: rgb(0, 0, 0);"><br></div><div style="font-family: Arial; font-size: 14px; color: rgb(0, 0, 0);"><span><span>(*) The audio file is obtained from <span><a target="_blank" rel="noreferrer nofollow noopener" href="https://freepd.com/">https://freepd.com/</a></span>, under CC0 license.</span><br></span></div><div style="font-family: Arial; font-size: 14px; color: rgb(0, 0, 0);"><br></div><div style="font-family: Arial; font-size: 14px; color: rgb(0, 0, 0);">Thanks for reading :)</div><div style="font-family: Arial; font-size: 14px; color: rgb(0, 0, 0);">Thanks for GStreamer!<br></div><div style="font-family: Arial; font-size: 14px; color: rgb(0, 0, 0);">Arun Mani J</div><div style="font-family: Arial; font-size: 14px; color: rgb(0, 0, 0);"><br></div><div style="font-family: Arial; font-size: 14px; color: rgb(0, 0, 0);">(I have not subscribed to the mailing list, so please CC me in replies)<br></div>