case AVERROR_PATCHWELCOME: errstr = "Not yet implemented in FFmpeg, patches welcome"; break;
case AVERROR_PROTOCOL_NOT_FOUND:errstr = "Protocol not found" ; break;
case AVERROR_STREAM_NOT_FOUND: errstr = "Stream not found" ; break;
case AVERROR_PATCHWELCOME: errstr = "Not yet implemented in FFmpeg, patches welcome"; break;
case AVERROR_PROTOCOL_NOT_FOUND:errstr = "Protocol not found" ; break;
case AVERROR_STREAM_NOT_FOUND: errstr = "Stream not found" ; break;