Hi Marc, Hi Carl, Just wanted to let you know, I ran into the same issue and tracked the problem to the mxf muxer. In the "mxf_parse_dv_frame" (mxfenc.c) method, replacing "if ((vs_pack[2] & 0x07) == 0x02)" with "if ((vsc_pack[2] & 0x07) == 0x02)" solved the issue, at least in my case. Best, Jean.