<html> <head> <title>Samsung Enterprise Portal mySingle</title> <meta content="text/html; charset=utf-8" http-equiv="Content-Type" /> <style id="mysingle_style" type="text/css"> p, td, li {font-family:Arial, arial; font-size:9pt; margin-top:5px;margin-bottom:5px;} body{margin:10px 10px 10px 10px; line-height:1.4; font-family:Arial, arial;}</style> </head> <body style="FONT-FAMILY: Arial; WORD-WRAP: break-word; FONT-SIZE: 10pt"> Hello everyone! Trying to encode video using libav through gst-libav I faced following problem: SIGSEGV in av_opt_find2(gst-libs/ext/libav/libavuti;/opt.c) on line: if(!strcmp(o->name, name) && (o->flags & opt_flags) == opt_flags && Problem is: code tryes to access field name on object o of type AVOption when o is invalid. After investigation I found that problem is cast of method param obj to type AVClass, but av_opt_set_int passes &ffmpegmux->context there, which is of type AVFormatContext*. AVFormatContext struct contains field av_class of type AVClass*, so change of code from: av_opt_set_int(&ffmpegmux->context, "preload", ffmpegmux->preload, 0); to av_opt_set_int(&ffmpegmux->context->av_class, "preload", ffmpegmux->preload, 0); fixes my problem. But question is: I'm not sure at this moment that my change is correct one in the sense of gstavmux logic and libav usage. If my change is correct, I would create issue in bugzilla and attach patch there.  WBR, Dmitry Melnichenko <table id="confidentialsignimg"> <tbody> <tr> <td namo_lock="namo_lock"> <img border="0" alt="" src="cid:1CA8977932ED416E9D8527468A2126E80@samsung.net" width="520" /></td> </tr> </tbody> </table> </body> </html><img src='http://ext.w1.samsung.net/mailcheck/SeenTimeChecker?do=3e4f407a6b00dcd0f5e01978836bf23e8c9e07760bcbd46a033cd743df334a6c27f9078a62f7f8599aba4bb3b2b5ca437ba1b0745ef9b1bd8228f4fb11dfa5b9ba7e558302beb322f3f842f026c9a736cf878f9a26ce15a0' border=0 width=0 height=0 style='display:none'>