I&#39;ve been struggling for the past few hours with ffmpeg trying to create an video file that Gem will accept that contains an alpha channel from a series of tiff images.  While searching for answers I found some messages that mention that new versions of Gem are using gmerlin as an a/v decoder which should open it to many more formats.<div>
<br></div><div>I&#39;m currently on Ubuntu 9.10 with pd-extended version 0.42.5-extended-20091114.  I probably installed it from a .deb package somewhere.  Gem info:</div><div><div>GEM: Graphics Environment for Multimedia</div>
<div>GEM: ver: 0.93.CVS </div><div>GEM: compiled: Nov 14 2009</div><div><br></div><div>Is gmerlin support included in that Gem version?  Is it a simple matter of enabling it?  Are the Gem .debs with it built in?  Will I have to compile from source to get what I want?</div>
<div><br></div><div><br></div><div>Also, I&#39;m fully open to any suggestions on how to make alpha-channel enabled videos that Gem can read.</div><div>My ffmpeg line for jpeg sequences is:</div><div><div>ffmpeg -f image2 -vcodec copy -i sample%04d.jpg sample.avi</div>
<div><br></div></div><div>If I try the same with alpha enabled .png files, Gem throws errors about MPNG:</div><div><div>&lt;AVI reader&gt; : Stream 0 vids : MPNG (0x474e504d) 117 chunks (0.46KB)</div><div>&lt;reader&gt; : Initialized video stream (chunk tblsz: 117, fmtsz: 40)</div>
<div>&lt;codec keeper&gt; : Found 5 plugins (/usr/lib/avifile-0.7,A:22,V:32)</div><div>&lt;codec keeper&gt; : CreateVideoDecoder(): Unknown codec 0x474e504d = &quot;MPNG&quot;</div><div><br></div></div><div>Thanks,</div><div>
<br></div><div>-martin</div></div>